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If luminous efficiency of a lamp is 2 lumen/watt and its luminous intensity is 42 candela, then power of the lamp is
|
(a) 62 W |
(b) 76 W |
(c) 138 W |
(d) 264 W |
The equivalent capacitance in the circuit between A and B will be
|
(a) 1 μF |
(b) 2 μF |
(c) 3 μF |
(d) |
Two parallel plates separated by a distance of 5mm are kept at a potential difference of 50 V. A particle of mass 
and charge 
enters in it with a velocity 
. The acceleration of the particle will be
|
(a) |
(b) |
(c) |
(d) 2 |
If m is magnetic moment and B is the magnetic field, then the torque is given by
|
(a) |
(b) |
(c) |
(d) | |
The magnetic field to a small magnetic dipole of magnetic moment M, at distance r from the centre on the equatorial line is given by (in M.K.S. system)
|
(a) |
(b) |
(c) |
(d) |
Two small conducting spheres of equal radius have charges +10Μc and -20 μC respectively and placed at a distance R from each other experience force 
. If they are brought in contact and separated to the same distance, they experience force 
. The ratio of to is
|
(a) 1 : 8 |
(b) – 8 : 1 |
(c) 1 : 2 |
(d) – 2 : 1 |
