- AThe electric force between them increases.
- BThe electric force between them decreases.
- CThe net downward force will increase.
- DThe net downward force will remain unchanged.
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A current carrying long solenoid is placed on the ground with its axis vertical. A proton is falling along the axis of the solenoid with a velocity v. When the proton enters into the solenoid, it will
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(a) Be deflected from its path |
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(b) Be accelerated along the same path |
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(c) Be decelerated along the same path |
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(d) Move along the same path with no change in velocity |
A radioactive sample with a half life of 1 month has the label : “Activity=2 micro curies on 1.8.1991.'' What will be its activity two months later
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(a) 1.0 micro curies |
(b) 0.5 micro curies |
(c) 4 micro curies |
(d) 8 micro curies |
Select the correct alternative, The angle between the normal and refracted ray is called:
Five lumen/watt is the luminous efficiency of a lamp and its luminous intensity is 35 candela. The power of the lamp is
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(a) 80 W |
(b) 176 W |
(c) 88 W |
(d) 36 W |
The bottom of a container filled with liquid appear slightly raised because of
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(a) Refraction |
(b) Interference |
(c) Diffraction |
(d) Reflection |
If two electric bulbs have 40 W and 60 W rating at 220 V, then the ratio of their resistances will be
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(a) 9 : 4 |
(b) 4 : 3 |
(c) 3 : 8 |
(d) 3 : 2 |