- AMaximum
- BMinimum
- CConstant
- DZero
Explanation:
The potential difference between any two points on an equipotential surface is zero.
Work done = Test charge x potential difference(0)
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In the lowest energy level of hydrogen atom, the electron has the angular momentum
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(a) |
(b) h/ |
(c) h/2 |
(d) |
A dip needle vibrates in the vertical plane perpendicular to the magnetic meridian. The time period of vibration is found to be 2 seconds. The same needle is then allowed to vibrate in the horizontal plane and the time period is again found to be 2 seconds. Then the angle of dip is
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(a) 0o |
(b) 30o |
(c) 45o |
(d) 90o |
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(a) |
(b) |
(c) |
(d) |
The cathode of a photoelectric cell is changed such that the work function changes from W1 to W2 (W2>W1). If the current before and after change are I1 and I2, all other conditions remaining unchanged, then (assuming hn > W2)
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(a) |
(b) |
(c) |
(d) |
Use of eddy currents is done in the following except
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(a) Moving coil galvanometer |
(b) Electric brakes |
|
(c) Induction motor |
(d) Dynamo |
The work function of a substance is 4.0 eV. The longest wavelength of light that can cause photoelectron emission from this substance is approximately
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(a) 540 nm |
(b) 400 nm |
(c) 310 nm |
(d) 220 nm |
In a Young's double slit experiment, the fringe width is found to be 0.4 mm. If the whole apparatus is immersed in water of refractive index 4/3 without disturbing the geometrical arrangement, the new fringe width will be
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(a) 0.30 mm |
(b) 0.40 mm |
(c) 0.53 mm |
(d) 450 micron |
If a slab of insulating material 4
thick is introduced between the plates of a parallel plate capacitor, the separation between plates has to be increased by 3.5
to restore the capacity to original value. The dielectric constant of the material will be
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(a) 6 |
(b) 8 |
(c) 10 |
(d) 12 |