| 1 |
The motional emf is give by |
- A. qvB
- B. IBL
- C. eBL
- D. vBL
|
| 2 |
If speed of rotation of a generator is doubled the output voltage will be. |
- A. Remain same
- B. Double
- C. Four time
- D. One half
|
| 3 |
The motional emf developed in a conduction depends upon. |
- A. Length
- B. Orientation
- C. Magnetic field
- D. All of the above
|
| 4 |
If we make magnetic field stronger the value of induced current is. |
- A. Decreased
- B. Increased
- C. Vanishes
- D. Remain constant
|
| 5 |
When the back emf in a current is zero, it draws |
- A. Zero current
- B. Maximum current
- C. Minimum current
- D. Steady average current
|
| 6 |
Induced emf in A.C. generator can be increased by |
- A. Decreasing area of coil
- B. Decreasing magnetic field
- C. Increasing area of coil
- D. Slowing down speed of coil
|
| 7 |
Mutual induction has a practical role in the performance of the. |
- A. Radio choke
- B. Transformers
- C. A.C. Generator
- D. D.C. Generator
|
| 8 |
Efficiency of transformer does not affected by |
- A. Input voltage
- B. Core of transformer
- C. Insulation between sheet
- D. Resistance of coils
|
| 9 |
A metal rod of 1 m is moving at a speed of 1 ms-1 in a direction making an angle 30<sup> o</sup> with 0.5 T magnetic field . The emf produced is. |
- A. 0.25 N
- B. 2.5 N
- C. 0.25 V
- D. 2.5 V
|
| 10 |
Electromagnetic induction is exactly according to law of: |
- A. Momentum
- B. Charge
- C. Energy
- D. Mass
|