Electromagnetic Induction — Practice Quiz
ICSE · Class 12 · Physics
Try a 4-question quiz on Electromagnetic Induction for ICSE Class 12 Physics: tap an answer to check it and see why. 51 questions in the full chapter test.
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Quick Quiz: Electromagnetic Induction
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A 0.80 m long rod rotates about one end in a uniform magnetic field of 0.75 T with angular velocity 30 rad/s. What emf is induced across the rod?
A secondary coil has 300 turns and mutual inductance with the primary coil is 0.60 H. If the primary current changes by 5.0 A in 0.10 s, what emf is induced in the secondary?
A rod of length 0.40 m moves at 5.0 m/s at right angles to a magnetic field of 0.25 T. If the circuit resistance is 2.0 Ω, what current flows?
An inductor of 4.0 H stores energy when the current through it is 3.0 A. What energy is stored?
Sample Questions
A copper sheet is withdrawn from a magnetic field so that the magnetic flux linked with it decreases. Which statements about the eddy currents are correct?
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They oppose the decrease of flux, They are also called Foucault currents, Their magnitude depends on the resistance of the metal
Eddy currents are induced currents in the body of the metal. They oppose the change in flux, are also called Foucault currents, and become feeble when resistance is large.
Which statements about self-induction and mutual induction are correct?
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Self-induction is an emf induced in the same coil due to change of its own current, Mutual induction is an emf induced in a secondary coil due to change of current in a primary coil, Both are measured in henry
Self-induction and mutual induction are distinct. The coefficient of self-induction and mutual inductance both use the unit henry.
For a long air-cored solenoid, which statements about self-inductance are correct?
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L is proportional to N squared, L is proportional to cross-sectional area A, L becomes larger with an iron core of relative permeability greater than 1
For a solenoid, L = μ0N^2A/l and with a core L = μrμ0N^2A/l. So L rises with N^2, A, and μr.
A conductor of length 0.60 m moves at 3.0 m/s parallel to a magnetic field. What motional emf is induced?
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0 V
No potential difference is induced when either the velocity or the length is parallel to the magnetic field. Since the conductor moves parallel to the field, the motional emf is zero.
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