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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 copper ring is suspended by a thread in a vertical plane. One end of the magnet is brought horizontally towards the ring. How will be the position of the ring affected?
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.
can any please xplain ac generator?
description about dead beat galvanometer
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)
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 28 turn coil with average diameter of 0.02 m is placed perpendicular to a magnetic field of 8000 T. if the field changes to 3000 T in 4 s, what is the magnitude of the induced emf
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?
WHAT IS A CHOKE COIL?? ITS ADVANTAGES AND APPLICATION
why is spark produced in the switch of a fan ,when it is switched off?
Derivation for Energy Stored in an INDUCTOR
What is motional E.M.F? Derive expression for it.
1.A coil is mechanically rotated with constant angular speed (w) in a uniform magnetic field which is parallel to the axis of rotation of the coil, the plane of the coil initially held perpendicular to the field. Plot a trap showing variation of 1. Magnetic flux 2. The induced emf in the coil as a function of (wt).
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.
why does deflection in the galvanometer increases dramatically when the iron rod is inserted along the axis of two coils?
factors on which mutual inductance of two coils depends
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?
an iron bar falling through the hollow region of a thick cylindrical shell made of copper experiences a retarding force. what can you conclude about the nature of the iron bar
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.
Prove that E=1/2LI^2
a coil having L = 2 mH current flowing through it is I = t2 e-t then the time at which emf become 0
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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