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Long Type Questions(3 marks)
what is displacement current????
what is conduction current???
identify the part of the electromagnetic spectrum which is
1.suitable for radar system used in aircraft navigation.
2.adjacent to low frequency end of the electromagnetic spectrum.
3.produced in nuclear reactions.
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???
self induction is called the inertia of electricity.why?
show that lenz's law is in accordance with the law of conservation of energy???
A coil of mean area 500 cm^2 of having 1000 turns is held perpendicular to a uniform field of 0.4 Gauss.The coil is turned through 180 degree in 1/10th of a second.Calculate the average induced E.M.F.
Why a transformer cannot step up dc voltage?
Prove that an ideal inductor does not dissipate power in an a.c circuit.
What is The difference Between Lenz's law and lorentz force??
can any please xplain ac generator?
Magnetic field in a region is equal to B. A loop of resistance R and radius r is lying in the field with the plane perpendicular to the field if the loop is turned by 180 degree. Find the charge which flows through a given cross section of the loop
description about dead beat galvanometer
Q11.Which unit denotes the dimensions ML2T−2A−1?
Which unit denotes the dimensions ML2T−2A−1?
i cant understand plz derive dimensional formula for all of above quantities.
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?
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
Numerical Questions(2 marks)
WHAT IS A CHOKE COIL?? ITS ADVANTAGES AND APPLICATION
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.
how to make project on mutual induction?
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...
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?
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.
Derivation for Energy Stored in an INDUCTOR
What is motional E.M.F? Derive expression for it.
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.
what is the dimention formula of induced emf
Could you please derive the mutual induction and self induction for a conductor?
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)
Define fringe width, Derive an expression for fringe width in youngâsdouble slitexperiment.
factors on which mutual inductance of two coils depends
why is spark produced in the switch of a fan ,when it is switched off?
HOW IS EDDY CURRENT USEFUL IN ELECTRIC POWER METERS?
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?
Write einstein photoelectric equation. Explain laws of photoelectric emission on the basis of this equation.
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.
Prove that E=1/2LI^2
Show mathematically that potential at a point on the equatorial line of an electric dipole is zeroA storage battery of emf 12 V and internal resistance 0.5 Ω is to be charged by a 120 V d.c. supply of negligible internal resistance. What resistance is required in the circuit for the charging current to be 3 A ? What is the terminal voltage of the battery during charging?Using Ampere circuital law derive an expression for the magnetic field along the axis of a torodial solenoidDerive the expression for the self-inductance of a solenoid.In a given circuit inductor L and resister 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 earlierwill the lamps be equally bright after some time? Justify your answer.Define one coulomb of charge.The small ozone layer on the top of the stratosphere is crucial for human survival, why?Why can’t a transformer be used to step up dc voltage?What is the nature of the magnetic field in a moving coil galvanometer?The current is set up in a long copper pipe. Is there a magnetic fieldinsideoutside the pipe?Sketch three equipotential surfaces for a pt. charge.How is the coulomb force between two charges affected by the presence of the third charge?What is the cause of induced emf?Why are microwaves used in RADAR?A uniform magnetic field gets modified as shown below, When two specimens X and Y are placed in it.dentify the two specimens X and YState the reason for the behaviour of the field lines in X and Y.Give any one difference between FAX and e-mail systems of communication.Give the ratio of the number of holes and number of conduction electrons in an intrinsic semiconductor.How does focal length of a lens change when red light is replaced by blue light?How does the intensity of central maximum change, if the width of the slit is halved in a single slit diffraction experiment?How will the photoelectric current change on decreasing the wavelength of incident radiation for a given photosensitive material?In which series of hydrogen spectra, the transitions involve the longest changes energy?What is the mass of pion plus (p+)?Vehicles moving in foggy weather use yellow colour head-lights. Why?Name the physical quantity whose S.I. unit is :Coulomb Per VoltVolt/ meter.
a coil having L = 2 mH current flowing through it is I = t2 e-t then the time at which emf become 0
in faraday's experimental conclusion plzzz tell the direction of flow of current and deflection in galvanometer in all it's 5 conclusions????
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 !
plz...i can't undrstd working of a.c generator??
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