Two plates are at potentials –10 V and +30 V. If the separation between the plates be 2 cm. The electric field between them is
|
(a) 2000 V/m |
(b) 1000 V/m |
(c) 500 V/m |
(d) 3000 V/m |
(a) 2000 V/m
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
The work done in placing a charge of 8 × 
coulomb on a condenser of capacity 100 micro-farad is
|
(a) 32 |
(b) 16 |
(c) 3.1 |
(d) 4 |
An antenna is a device
|
(a) That converts electromagnetic energy into radio frequency signal |
|
(b) That converts radio frequency signal into electromagnetic energy |
|
(c) That converts guided electromagnetic waves into free space electromagnetic waves and vice-versa |
|
(d) None of these |
Rutherford’s a - particle experiment showed that the atoms have
|
(a) Proton |
(b) Nucleus |
(c) Neutron |
(d) Electrons |
If the separation between slits in Young’s double slit experiment is reduced to 
the fringe width becomes n times. The value of n is
|
(a) 3 |
(b) |
(c) 9 |
(d) |
A wire in the form of a circular loop of one turn carrying a current produces a magnetic field B at the centre. If the same wire is looped into a coil of two turns and carries the same current, the new value of magnetic induction at the centre is
|
(a) 5B |
(b) 3B |
(c) 2B |
(d) 4B |
An electron is travelling in east direction and a magnetic field is applied in upward direction then electron will deflect in
|
(a) South |
(b) North |
(c) West |
(d) East |
