64 identical spheres of charge q and capacitance C each are combined to form a large sphere. The charge and capacitance of the large sphere is
Options
(a) 64q, C (b) 16q, 4C (c) […]
A condenser has a capacity 2 μF and is charged to a voltage of 50 V. The energy stored is
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(a) 25×10⁵ joule (b) 25 joule (c) 25×10 erg (d) 25×10³ erg
Correct […]
A hollow sphere of radius 0.1m has a charge of 5×10⁻⁸C. The potential at a distance of 5cm from the centre of the sphere is (1/4πε₀=9×10⁹NM²C⁻²)
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(a) 4000V (b) 4500V (c) 5000V […]
4 point charges each +q is placed on the circumference of a circle of diameter 2d in such a way that they form a square. The potential at the centre is
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(a) […]
A charge Q is uniformly distributed over a large plastic plate. The electric field at point P close to centre of plate is 10Vm⁻¹. If the plastic plate is replaced by copper plate of the […]
A comb run through one’s dry hair attracts small bits of paper. This is due to
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(a) comb is good conductor (b) paper is good conductor (c) atoms in paper gets polarised […]
A body has 80 microcoulomb of charge. Number of additional electrons in it will be
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(a) 8 x 10⁵ (b) 80 x 10¹⁷ (c) 5 x 10¹⁴ (d) 1.28 x 10¹⁷
Correct […]
Electric potential at any point is V= -5x +3y + √(15) z. Then the magnitude of electric field is
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(a) 3 √2 (b) 4 √2 (c) 5 √2 (d) 7
Correct Answer: […]
A charge of 40 µC is given to a capacitor having capacitance C=10 µF. The stored energy in erg is
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(a) 80 x 10⁻⁶ (b) 800 (c) 80 (d) 8000
Correct Answer: […]
Two charges each equal to 2µ C are 0.5m apart. If both of them exist inside vacuum, then the force between them is
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(a) 1.89 N (b) 2.44 N (c) 0.144 N […]
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