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Long Type Questions(3 marks)
what is displacement current????
what is conduction current???
i need numericals solutions of nootan for physics plz help me to find this?
derive the dimensional formula of magnetic flux with each steps clearly???
A simple pendulum with bob of mass m and conducting wire of length L swings(is hanging ) under gravity thro' an angle 2theetha.
The earth's magnetic feild component in the direction perpendicular to swing is B.
the max potential diff induced across pendulum is?
self induction is called the inertia of electricity.why?
show that lenz's law is in accordance with the law of conservation of energy???
the equivalent inductance of two inductors is 2.4 H when connected in parallel and10 H when connected in series .The difference between two inductance is(neglecting mutual induction between coils)
Why a transformer cannot step up dc voltage?
can any please xplain ac generator?
Prove that an ideal inductor does not dissipate power in an a.c circuit.
description about dead beat galvanometer
a coil having L = 2 mH current flowing through it is I = t2 e-t then the time at which emf become 0
Draw a labelled ray diagram to show the formation of an image by a compound microscope. Write the expression for its magnifying power. How does the resolving power of a compound microscope change, whenrefractive index of the medium between the object and the objective lens increases; andwavelength of the radiation used is increased?An electric dipole is held in a uniform electric field.Using suitable diagram, show that it does not undergo any translatory motion andderive an expression for the torque acting on it and specify its direction.Draw a graph to show the variation of the angle of deviation 'D' with that of the angle of incidence 'i' for a monochromatic ray of light passing through a glass prism of refracting angle 'A'. Hence deduce the relation.Two long parallel straight wires X and Y separated by a distance of 5 cm in air carry currents of 10 A and 5 A respectively in opposite directions. Calculate the magnitude and direction of the force on a 20 cm length of the wire Y.A circcircular coil of100 turns, radius 10 cm carries a current of 5 A. it is suspended vertically in a uniform horizontal magnetic field of 0.5 T, the field lines making an angle of 600 with the of the plane of the coil. Calculate of the torque must be applied on it to prevent it from turning.Two point chargesare located 20 cm apart in vacuum,Find the electric field at the mid point of the line AB joining the two charges,If a negative test charge of magnitude 1.5 x10-9c is placed at the centre, find the force experienced by the test charge.In a given circuit, inductor L and resistor R have identical resistance. Two similar electric lamps B1and B2are connected as shown. When switch S is closed,which one of the lamps lights up earlier,will the lamps be equally bright after some time? Justify your answer.Write the mathematical relation for the resistivity of a material in terms of relaxation time, number density and mass and charge of charge carriers in it. Explain, using this relation, why the resistivity of a metal increases and that of a semi-conductor decreases with rise in temperature.Name the gate obtained from the combination of gates shown in the figure. Draw its logic symbol. Write the truth table of the combination.Force of attraction between two point charges placed at a distance ‘d’ apart in a medium is ‘F’. What should be the distance in the same medium so that the force of attraction between them becomes 9F ?Two bulbs whose resistances are in the ratio of 1 : 2, are connected in parallel to a source of constant voltage. What will be the ratio of power dissipation in these?Write two properties of a material used as a suspension wire in a moving coil galvanometer.A plane electromagnetic wave of frequency 25 MHz travels in free space along the x-direction. At a particular point in space and time the electric vector is. Calculateat this point.Define the term ‘activity’ of a radionuclide. Write its SI unit.At what angle of incidence should a light beam strike a glass slab of refractive - index √3 , such that the reflected and the refracted rays are perpendicular to each other ?A carrier wave of peak voltage 12 V is used to transmit a message signal. What should be the peak voltage of the modulating signal in order to have a modulation index of 75 %?Which mode of propagation is used by short wave broadcast services having frequency range from a few MHz up to 30 MHz?Derive an expression for the energy stored in a charged parallel plate capacitor with air as the medium between its plates.A bar magnet of magnetic moment 1.5 J/T lies aligned with the direction of a uniform magnetic field of 0.22 T.What is the amount of work required by an external torque to turn the magnet so as to align its magnetic moment,normal to the field direction, & Opposite to the field direction?
Numerical Questions(2 marks)
2 identical loops are of copper and d other of aluminium r rotated wid same angular speed in d same magnetic field compare
i) induced EMF ii)current produced in 2 coils
justify ur answer
A metallic rod of length l is rotating with an angular frequency w(omega) with one end hinged at the centre and other end at the circumference of a circular metallic ring of radius l about an axis passing through the centre & perpendicular to the plane of rotation. A uniform magnetic field of B tesla is perpendicular to the plane of rotation every where. Find the emf between the centres and the metallic ring.
the armature of a generator of resistance 1 ohm is rotated at its rated speed produces 125V without load 115 V with full load . the current in the armature coil is
how to make project on mutual induction?
HOW DOES THE MUTUAL INDUCTANCE OF A PAIR OF COIL CHANGE WHEN
1 THE DISTANCE B/W 2 COIL IS INCREASED
2 NUMBER OF TURNS IN EACH OF 2 COIL IS DECREASED
a circular ring of diameter 20 cm has a resistance 0.01 ohm. The ring is turned from a position perpendicular to a magnetic field of 2 T to a position parallel to the field. The amount of charge flowing through the ring in the process is?
Two identical loops, one of copper and other of aluminium are rotated with the same angular speed in the magnetic field.Compare 1) induced emf 2) the current prodeuced in two coils. Justify your answer.
A conducting rod of length L with one end pivoted is rotated with uniform angular speed W in a vertical plane normal to the magnetic field B.Deduce an expression for emf induced in this rod.?plz answer this question as soon as possible and if possible plz answer the question today only..plz plz plz...
WHAT IS A CHOKE COIL?? ITS ADVANTAGES AND APPLICATION
A square loop of side 10cm and resistance 0.5 ohm is placed vertically in the east-west plane .Auniform magnet field of 0.10 T is set up across the plane in the north - east direction . The magnitudes field is decreased to zero in 0.07s at a steady rate . determine the magnitude of induced emf and current during this time-interval .
Derivation for Energy Stored in an INDUCTOR
long solenoid with 15 turns per cm has a small loop of area 2.0 cm2
placed inside the solenoid normal
to its axis. If the current carried by the solenoid changes steadily
from 2.0 A to 4.0 A in 0.1 s, what is the induced emf in the loop
while the current is changing?
what is the dimention formula of induced emf
Could you please derive the mutual induction and self induction for a conductor?
A coil of inductance 2H and resistance 10 ohm is connected across a battery of 100 V alond with a key . At time t=0 the key is closed find the current in the circuit at t=1sec? Kindly answer sir/mam.
factors on which mutual inductance of two coils depends
What is motional E.M.F? Derive expression for it.
Radius of a circular loop placed in a perpendicular uniform magnetic field is increasing at a constant rate of ro m/s. If at any instant, radius of the loop is r, then emf induced in the loop at that instant will be??
Define fringe width, Derive an expression for fringe width in youngâsdouble slitexperiment.
A flat coil of 500 turns, each of area 50 cm2, rotates about a diameter in a uniform magnetic field of flux density 0-14 Wbm'2, the axis of rotation being perpendicular to the field and the angular velocity of rotation being 150 rad/s. The coil has a resistance of 5 H and the induced e.m.f. is connected via slip rings and brushes to an external resistance of 10 ii. Calculate the peak" current flowing.
Electromagnets are made of soft iron because soft iron has:
low retentivity and high coercive force
high retentivity and high coercive force
low retentivity and low coercive force
high retentivity and low coercive force
Kindly explain the answer also.
The arm PQ of the rectangular conductor is moved from x=0, outwards. The uniform magnetic field is perpendicular to plane and exerts from x=0 to x=b and is 0 for x > b. Only the arm PQ possess substantial resistance r. Consider the situation when the arm PQ is pulled outward from x = 0 to x= 2b, and is then moved back to x=0 with constant speed v. Obtain expression for the flux, induced emf, the force necessary to pull the arm and the power dissipated as joule heat. Sketch the variation of these quantities with distance.
A metallic rod of length l is rotated at a constant angular speed omega, normal to a uniform magnetic field B. Derive an expression for the current induced in the rod, if the resistance of the rod is R.
why is spark produced in the switch of a fan ,when it is switched off?
plz...i can't undrstd working of a.c generator??
Prove that E=1/2LI^2
Define self – inductance and give its S.I. unit.Derive an expression for self inductance of a long, air-cored solenoid of length l, radius r and having N number of turns.Name the radiations of electromagnetic spectrum which are used inWarfare to look through fog.Radar and geostationary satellites.Studying the structure and properties of atoms and molecules.To photograph internal parts of a human body.The work function of cesium metal is 2 .14 eV. When light of frequency 6 x 10 14 Hz is incident on the metal surface, photoemission of electrons occurs. What is theMaximum kinetic energy of the emitted electrons.An electron beam projected along +X axis, experiences a force due to a magnetic field along the + Y- axis. What is the direction of the magnetic field?The instantaneous current from an ac source is I = 6 sin 314t. What is the rms value of the current?A bulb connected in series with a solenoid is lit by ac source. If a soft iron core is introduced in the solenoid, will the bulb glow brighter?Which part of the electromagnetic spectrum is used in operating RADAR? Give its wavelength range.Two thin lenses + 6D and -2D are in contact. What is the focal length of the combination?The ionization potential of hydrogen is 13.6 V. calculate the energy of its first excited state.How does the collector current change in a junction transistor, if the base region has larger width?How does the conductivity change of a semiconductor with increase of temperature?Define the term temperature coefficient of resistivity. Draw a graph showing the variation of reistivity with temperature for copper.S1and S2are two hollow concentric sphere enclosing charges Q and 2Q respectively as shown in fig.What is the ratio of electric flux through S1& S2?How will the electric flux through the sphere change, if a medium of dielectric constant 5 is introduced in the space inside S1in place of air?Two cells E1and E2in the given circuit diagram have an emf of 4V and 8V and internal resistance 0.5W and 1.0W respectively. Calculate the current flowing through the resistance of 3W.How will a dia & ferro magnetic material behave when kept in a non-uniform external field? Give two examples each.Write two applications of each, microwaves and infrared rays.A double concave lens of glass of RI 1.6 has radii of curvature of 40cm, 60cm. Calculate its focal length. Also find the focal length of the lens if the lens is immersed in a liquid of RI 1.3.Show that the de-Broglie wavelength l of electrons of energy E is given by the relation l =An electrical element x, when connected to an alternating voltage source, has the current through it leading the voltage by π/2 radii. Identify x and write an expression for its reactance.Identify the logic gate 1 and 2 in the logic circuit given. Also, write the truth table for the final output for all possible combination of inputs A and B. AЧ1 Ч2BWhat is the angle between the directions of electric field at anyaxial point andequitorial point due to an electric dipole?Whay should the spring/suspension wire in a moving coil galvanometer have low torsional constant?
A horizontal straight wire 10m long extending from east to west is falling with a speed of 5m pert sec.at right angles to the horizontal componen of the earths magnetic field 0.3 X 10 n^ -4
I know the answer to emf induced
Please in detail xplain me how to use flemings right hand rule here Becoz only direction of force is known i.e downward .. which is at high potential and why !!M not clear !
Submitted By : Mr. Ajay YadavEmail: email@example.com
The motion of a copper plate is damped when it is allowed to oscillatebetween the magnetic pole-pieces. How is the damping force, produced bythe eddy currents?
If number of turns of a solenoid is doubled while keeping all other factors constant, what would be the change in its self-inductance?
Two resistors of 10 ohm and 20 ohm and an ideal inductor of 10H are connected to a 2v battery. The key is shorted at time t=0. Find the initial and final currents through the battery.
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