- AAll electrons have magnetic moment.
- BAll protons have magnetic moment.
- CAll nuclei have magnetic moment.
- DAll atoms have magnetic moment.
Explanation:
All the electrons have magnetic moment & All the protons have magnetic moment.
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A hollow insulated conducting sphere is given a positive charge of 10μC. What will be the electric field at the centre of the sphere if its radius is 2 meters
|
(a) Zero |
(b) 5 |
(c) 20 |
(d) 8 |
If yellow light in the Young's double slit experiment is replaced by red light, the fringe width will
|
(a) Decrease |
(b) Remain unaffected |
|
(c) Increase |
(d) First increase and then decrease |
The current sensitivity of a moving coil galvanometer can be increased by
|
(a) Increasing the magnetic field of the permanent magnet |
|
(b) Increasing the area of the deflecting coil |
|
(c) Increasing the number of turns in the coil |
|
(d) a, b, c |
When light rays are incident on a prism at an angle of 45°, the minimum deviation is obtained. If refractive index of the material of prism is , then the angle of prism will be
|
(a) 30° |
(b) 40° |
(c) 50° |
(d) 60° |
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 ° |
Banding of a stick when placed in water is because: