| 1 |
B2/2p is the expression of. |
- A. Lenz's law
- B. Magnetic energy
- C. Magnetic energy density
- D. Back emf
|
| 2 |
DC generator by william Sturgeon in: |
- A. 1894
- B. 1961
- C. 1834
- D. 1961
|
| 3 |
In A.C. generator , when plane of coil is perpendicular to magnetic field, then output of generator is. |
- A. NwAB
- B. 2pi f
- C. Maximum
- D. Zero
|
| 4 |
Lenz's law was given by Heinrich lenz in: |
- A. 1894
- B. 1904
- C. 1854
- D. 1834
|
| 5 |
In case of inductor , energy is stored in the |
- A. Electric field
- B. Magnetic field
- C. Potential field
- D. Gravitational field
|
| 6 |
The direction of induced current is always so as to oppose the change which causes the current, this is the statement of |
- A. Lenz's law
- B. Faraday's law
- C. Ampere's law
- D. Coulomb's law
|
| 7 |
Transformer is used to change |
- A. Electric power
- B. Magnetic field
- C. Alternating voltage
- D. Phase of A.C.
|
| 8 |
A simple device that prevents the direction of current from changing is called. |
- A. Commutator
- B. Rotor
- C. Armature
- D. Detector
|
| 9 |
The unit of induced emf is |
- A. Ampere
- B. Volt
- C. Joule/coulomb
- D. Both (b) and (c)
|
| 10 |
|
- A. Lenz's law
- B. Faraday's law
- C. Ampere's law
- D. None of these
|
