- Aan electric field.
- Ban induced emf.
- Ca magnetic field.
- Da magnetic dipole.
Explanation:
A charging electric field gives rise to a magnetic field.
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Which of the following statements are true about the magnetic susceptibility
of paramagnetic substance
|
(a) Value of |
|
(b) |
|
(c) |
|
(d) |
Which statement is correct for a zone plate and a lens
|
(a) Zone plate has multi focii whereas lens has one |
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(b) Zone plate has one focus whereas lens has multiple focii |
|
(c) Both are correct |
|
(d) Zone plate has one focus whereas a lens has infinite |
At two places A and B using vibration magnetometer, a magnet vibrates in a horizontal plane and its respective periodic time are 2 sec and 3 sec and at these places the earth's horizontal components are HA and HB respectively. Then the ratio between HA and HB will be
| (a) 9 : 4 | (b) 3 : 2 | (c) 4 : 9 | (d) 2 : 3 |
The focal length of a lens of refractive index $\mu$ is f. If the lens is immersed in a liquid of refractive index $\mu$ then the focal length of lens is:
A current of 10 ampere is flowing in a wire of length 1.5 m. A force of 15 N acts on it when it is placed in a uniform magnetic field of 2 tesla. The angle between the magnetic field and the direction of the current is
|
(a) 30 ° |
(b) 45 ° |
(c) 60 ° |
(d) 90 ° |
The energy of a photon of light with wavelength 5000 Å is approximately 2.5 eV. This way the energy of an X-ray photon with wavelength 1Å would be
|
(a) 2.5/5000 eV |
(b) |
(c) 2.5 × 5000 eV |
(d) |

+ 2C and +6C two charges are repelling each other with a force of 12N. If each charge is given -2C of charge, then the value of the force will be
|
(a) 4N (Attractive) |
(b) 4N (Repulsive) |
(c) 8N (Repulsive) |
(d) Zero |
Consider the circuit shown in the figure. The current is equal to
|
(a) 5 amp |
(b) 3 amp |
(c) -3 amp |
(d) -5/6 amp |