When a magnetic field is applied in a direction perpendicular to the direction of cathode rays, then their
|
(a) Energy decreases |
|
(b) Energy increases |
|
(c) Momentum increases |
|
(d) Momentum and energy remain unchanged |
(d) Momentum and energy remain unchanged
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Three capacitors are connected to D.C. source of 100 volts shown in the adjoining figure. If the charge accumulated on plates of 
and 
are 
and 
respectively, then
|
(a) |
(b) |
|
(c) |
(d) |
The distance between the extreme points on the periphery of the mirror is called:
Charge q is uniformly distributed over a thin half ring of radius R. The electric field at the centre of the ring is
|
(a) |
(b) |
(c) |
(d) |
A long solenoid of length L has a mean diameter D. It has n layers of windings of N turns each. If it carries a current ‘i’ the magnetic field at its centre will be
|
(a) Proportional to D |
(b) Inversely proportional to D |
|
(c) Independent of D |
(d) Proportional to L |
