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A circular conducting ring is rotated about one its diameter in a magnetic field

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Important Questions on Electromagnetic Induction

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Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment Set-2>Q 19
Figure shows two circular rings of radii a & b (a>b) joined together by wire of negligible resistance. If the arrangement is placed in a time varying magnetic field, dBdt=k and if the resistance per unit length of wire is λ, then induced current is

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Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment Set-2>Q 20
An electric motor runs a DC source of emf 200V and draws a current of 10A. If the efficiency is 40%, then the resistance of the armature is
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Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment Set-2>Q 21
Figure shows part of a circuit. If I=5 A and is decreasing at a constant rate of 103 A/s then VB-VA is

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Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment Set-2>Q 22
Two different coils have self inductances L1=8mH and L2=2mH. The current in both the coil is increased at same constant rate. At a certain instant power given to two coils is same. At that time the energy stored in both the coils are V1 & V2 respectively, then V1V2 is
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Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment Set-2>Q 23
A short solenoid of length 4 cm, radius 2 cm and 100 turns is placed inside and on the axis of a long solenoid of length 80 cm and 1500 turns. A current of 3 A flows through the short solenoid. The mutual inductance of two solenoids is
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Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment Set-2>Q 24
In the arrangement shown, what is the expression for emf induced in the smaller loop of radius r? The current I varies as I=3 t+5(R>>r)

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Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment Set-2>Q 25
A uniformly wound solenoid coil of self-inductance 1.8×10-4 H and resistance 6 Ω is broken up into two identical coils. These identical coils are then connected in parallel across a 12 V battery of negligible resistance. The time constant for the current in the circuit is
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Gamma Question Bank for Engineering Physics>Chapter 20 - Electromagnetic Induction>Assignment Set-2>Q 26
An inductor of inductance L is decayed through a resistance R. A radioactive sample decays with an average life T. The value of R for which the electric energy stored in the inductor to the activity of radioactive sample remains constant