When the distance between the charged particles is halved, the force between them becomes
|
(a) One-fourth |
(b) Half |
(c) Double |
(d) Four times |
(d) Four times
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Two copper balls, each weighing 10g are kept in air 10 cm apart. If one electron from every 
atoms is transferred from one ball to the other, the coulomb force between them is (atomic weight of copper is 63.5)
|
(a) 2.0 |
(b) 2.0 |
(c) 2.0 |
(d) 2.0 |
A capacitor is kept connected to the battery and a dielectric slab is inserted between the plates. During this process
|
(a) No work is done |
|
(b) Work is done at the cost of the energy already stored in the capacitor before the slab is inserted |
|
(c) Work is done at the cost of the battery |
|
(d) Work is done at the cost of both the capacitor and the battery |
and 
ions having same kinetic energy pass through a region of space filled with uniform magnetic field B directed perpendicular to the velocity of ions. The masses of the ions 
and are respectively in the ratio 1 : 4 : 16. As a result
|
(a) |
|
(b) |
|
(c) All ions will suffer the same deflection |
|
(d) a, b |
A power line lies along the east-west direction and carries a current of 10 ampere. The force per metre due to the earth's magnetic field of 
is
|
(a) |
(b) |
(c) |
(d) |
