Question 61 : In an A.C. generator, increase in number of turns in the coil _________
1. Increases emf
2. Decreases emf
3. Makes the emf zero
4. Maintains the emf at a constant value
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Question 62 : emf is zero if the angle between velocity and length is _____
1. 0⁰
2. 90⁰
3. 270⁰
4. 45⁰
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Question 63 : When a coil is rotated in a magnetic field, the emf induced in it?
1. Is maximum
2. Is minimum
3. Continuously varies
4. Remains constant
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Question 64 : Calculate the maximum emf when the velocity is 10m/s, the length is 3m and the magnetic field density is 5T.
1. 150V
2. 100V
3. 300V
4. 0V
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Question 65 : What should theta be in order to get maximum emf?
1. 0⁰
2. 90⁰
3. 180⁰
4. 45⁰
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Question 66 : Which, among the following, is the correct expression for alternating emf generated?
1. e=2Blvsin(?)
2. e=2B²lvsin(?)
3. e=Blvsin(?)
4. e=4Blvsin(?)
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