Two protons A and B are placed in space between plates of a parallel plate capacitor charged upto V volts (See fig.) Forces on protons are 
and 
, then
|
(a) |
(b) |
(c) |
(d) Nothing can be said |
(c) 
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There is a solid sphere of radius ‘R’ having uniformly distributed charge. What is the relation between electric field ‘E’ (inside the sphere) and radius of sphere ‘R’ is
|
(a) E ∝ |
(b) E ∝ |
(c) E ∝ |
(d) E ∝ |
A charge q coulomb moves in a circle at n revolutions per second and the radius of the circle is r metre. Then magnetic field at the centre of the circle is
|
(a) |
(b) |
|
(c) |
(d) |
All of the following statements are correct except
|
(a) The magnification produced by a convex mirror is always less than one |
|
(b) A virtual, erect, same-sized image can be obtained using a plane mirror |
|
(c) A virtual, erect, magnified image can be formed using a concave mirror |
|
(d) A real, inverted, same-sized image can be formed using a convex mirror |
Calculate the amount of charge flowing in 2 minutes in a wire of resistance 10 W when a potential difference of 20 V is applied between its ends
|
(a) 120 C |
(b) 240 C |
(c) 20 C |
(d) 4 C |
Three charges 2q, -q, -q are located at the vertices of an equilateral triangle. At the centre of the triangle
|
(a) The field is zero but potential is non-zero |
(b) The field is non-zero but potential is zero |
|
(c) Both field and potential are zero |
(d) Both field and potential are non-zero |
An air core solenoid has 1000 turns and is one metre long. Its cross-sectional area is 10 cm2. Its self inductance is
|
(a) 0.1256 mH |
(b) 12.56 mH |
(c) 1.256 mH |
(d) 125.6 mH |
