- AMoving magnet
- BStationary magnet
- CMoving charge
- DStationary charge
Explanation:
Magnetic fields are produced by magnetic bodies (Moving or stationary).
Moving charges produce electromagnetic fields. Stationary charges produce electric fields alone.
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Select the correct statement
|
(a) In a full wave rectifier, two diodes work alternately |
|
(b) In a full wave rectifier, two diodes work simultaneously |
|
(c) The efficiency of full wave and half wave rectifiers is same |
|
(d) The full wave rectifier is bi-directional. |

If the length of potentiometer wire is increased, then the length of the previously obtained balance point will
|
(a) Increase |
(b) Decrease |
(c) Remain unchanged |
(d) Become two times |
If the cathode–anode potential difference in an X-ray tube be 105 V, then the maximum energy of X-ray photon can be
| (a) 105 J | (b) 105 MeV | (c) 10–1 MeV | (d) 105 KeV |

The wavelength associated with an electron accelerated through a potential difference of 100 V is nearly
|
(a) 100 Å |
(b) 123 Å |
(c) 1.23 Å |
(d) 0.123 Å |