Class 11 Physics · Chapter 10 · Test 2
Faraday's and Lenz's Laws
36 MCQs This test covers motional emf (E = vBL), Faraday’s law, the dependence of induced emf on rate of flux change, and the number of turns. It also covers Lenz’s law and conservation of energy, the factors affecting induced emf, and numericals.
36 questions · 30 min · 36 marks
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Sample questions
The first 5 of 36. Try each one, then tap to see the answer.
Question 1
An emf is induced in a conductor when it moves in a magnetic field. This emf is called:
- AThermal emf
- BMotional emf
- CChemical emf
- DStatic emf
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Answer: B
The emf due to motion of a conductor in a field is motional emf.
Question 2
The motional emf of a rod of length L moving with speed v perpendicular to a field B is:
- AE = vB / L
- BE = vBL
- CE = BL / v
- DE = vL / B
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Answer: B
E = vBL.
Question 3
If a rod moves at angle θ to the field the motional emf is:
- AE = vBL cosθ
- BE = vBL
- CE = vBL sinθ
- DE = vBL tanθ
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Answer: C
Only the perpendicular component of velocity contributes.
Question 4
The motional emf is zero when the rod moves:
- APerpendicular to the field
- BParallel to the field
- CAt 90 degrees to B
- DFast
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Answer: B
sin 0 = 0 so there is no flux cutting.
Question 5
In a rod moving in a magnetic field the charges separate until the electric force balances the:
- AGravitational force
- BFrictional force
- CMagnetic force
- DCentripetal force only
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Answer: C
Equilibrium occurs when qE = qvB.
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