A solid conducting sphere having a charge Q is surrounded by an uncharged concentric conducting hollow spherical shell. Let the potential difference between the surface of the solid sphere and that of the outer surface of the hollow shell be V. If the shell is now given a charge of –3Q, the new potential difference between the same two surfaces is
|
(a) V |
(b) 2V |
(c) 4V |
(d) – 2V |
(a) V
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An elementary particle of mass m and charge +e is projected with velocity v at a much more massive particle of charge Ze, where Z > 0. What is the closest possible approach of the incident particle
|
(a) |
(b) |
(c) |
(d) |
A film projector magnifies a 100 cm2 film strip on a screen. If the linear magnification is 4, the area of magnified film on the screen is
|
(a) 1600 cm2 |
(b) 400 cm2 |
(c) 800 cm2 |
(d) 200 cm2 |
A cell of e.m.f 1.5 V having a finite internal resistance is connected to a load resistance of 2Ω. For maximum power transfer the internal resistance of the cell should be
|
(a) 4 ohm |
(b) 0.5 ohm |
(c) 2 ohm |
(d) None of these |
In a nuclear reactor, the fuel is consumed at the rate of 1 mg/s. The power generated in kilowatt is
(a) 9 
|
(b) 9 
|
(c) 9
|
(d) 9 
|
Lens used to remove long sightedness (hypermetropia) is
|
(a) Concave lens |
(b) Plano-concave lens |
|
(c) Convexo-concave lens |
(d) Convex lens |
The electric potential V is given as a function of distance x (metre) by 
)volt. Value of electric field at x = 1 is
|
(a) 20 V/m |
(b) 6 V/m |
(c) 11 V/m |
(d) -23 V/m |
