Explanation:
In a moving coil type of galvanometer needle deflects when torque in magnetic field is non - zero.
So, a moving coil galvanometer is based upon the principle that coil carrying current experiences a torque in a magnetic field.
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An ionization chamber with parallel conducting plates as anode and cathode has 5 
electrons and the same number of singly-charged positive ions per 
. The electrons are moving at 0.4 m/s. The current density from anode to cathode is 
. The velocity of positive ions moving towards cathode is
|
(a) 0.4 m/s |
(b) 16 m/s |
(c) Zero |
(d) 0.1 m/s |
A uniform but time-varying magnetic field B(t) exists in a circular region of radius a and is directed into the plane of the paper, as shown. The magnitude of the induced electric field at point P at a distance r from the centre of the circular region
|
(a) Is zero |
(b) Decreases as |
(c) Increases as r |
(d) Decreases as |
The relation between Faraday constant (F), chemical equivalent (E) and electrochemical equivalent (Z) is
|
(a) F = EZ |
(b) |
(c) |
(d) |
The momentum in mechanics is expressed as m × v. The analogous expression in electricity is
|
(a) I × Q |
(b) I × V |
(c) L × I |
(d) L × Q |
In Young's experiment, one slit is covered with a blue filter and the other (slit) with a yellow filter. Then the interference pattern
|
(a) Will be blue |
(b) Will be yellow |
(c) Will be green |
(d) Will not be formed |
A copper wire has a square cross-section, 2.0 mm on a side. It carries a current of 8 A and the density of free electrons is 8 
. The drift speed of electrons is equal to
|
(a) 0.156 × |
(b) 0.156 × |
(c) 3.12 × |
(d) 3.12 × |
