Explanation:
A galvanometer can be converted into voltmeter of given range by connecting a high resistance called multiplier in series with the galvanometer, whose value is given as:
$\text{R}\Big(\frac{\text{V}}{\text{I}_\text{g}}\Big)-\text{G}$
Where V is the voltage to be measured, Ig is the current for full scale deflection of galvanometer and G is the resistance of galvanometer.
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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) |
In a vibration magnetometer, the time period of a bar magnet oscillating in horizontal component of earth's magnetic field is 2 sec. When a magnet is brought near and parallel to it, the time period reduces to 1 sec. The ratio H/F of the horizontal component H and the field F due to magnet will be
| (a) 3 | (b) 1/3 |
(c) 
|
(d) 1/
|
When light is incident on a diffraction grating the zero order principal maximum will be
|
(a) One of the component colours |
(b) Absent |
|
(c) Spectrum of the colours |
(d) White |
The phenomenon of change in the _____of light when it passes from one transparent medium to another is refraction.
