Explanation:
Equipotential surface
→ P.D difference between two points on the surface is zero always since potential is same everywhere in equipotential surface.
→ The EF is always perpendicular to the surface because there is no potential gradient along any direction parallel to the surface P so no EF parallel to the surface
→ Equipotential surface can have any shape not just sphere.
→ No work is done in moving a charge along the surface, because potential difference is zero.
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Different voltages are applied across a P-N junction and the currents are measured for each value. Which of the following graphs is obtained between voltage and current
(a)
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(b)
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(c)
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(d)
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A capacitor is connected to a cell of emf E having some internal resistance r. The potential difference across the
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(a) Cell is < E |
(b) Cell is E |
(c) Capacitor is > E |
(d) Capacitor is < E |
An α- particle travels in a circular path of radius 0.45 m in a magnetic field B = 1.2 
with a speed of 2.6 
. The period of revolution of the α - particle is
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(a) 1.1 |
(b) 1.1 |
(c) 1.1 |
(d) 1.1 |
A student has 10 resistors of resistance ‘r’. The minimum resistance made by him from given resistors is
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(a) 10 r |
(b) |
(c) |
(d) |
A beam with wavelength 
falls on a stack of partially reflecting planes with separation d. The angle q that the beam should make with the planes so that the beams reflected from successive planes may interfere constructively is (where n = 1, 2, ……)
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(a) |
(b) |
(c) |
(d) |
If an electron jumps from 1st orbital to 3rd orbital, then it will
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(a) Absorb energy |
(b) Release energy |
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(c) No gain of energy |
(d) None of these |
