A 50 ohm galvanometer gets full scale deflection when a current of 0.01 A passes through the coil. When it is converted to a 10 A ammeter, the shunt resistance is
|
(a) 0.01 W |
(b) 0.05 W |
(c) 2000 W |
(d) 5000 W |
(b) 0.05 W
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For a metallic wire, the ratio V/i (V = the applied potential difference, i = current flowing) is
|
(a) Independent of temperature |
|
(b) Increases as the temperature rises |
|
(c) Decreases as the temperature rises |
|
(d) Increases or decreases as temperature rises, depending upon the metal |
A wire of diameter 0.02 metre contains 1028 free electrons per cubic metre. For an electrical current of 100 A, the drift velocity of the free electrons in the wire is nearly
|
(a) 1 × 10–19 m/s |
(b) 5 × 10–10 m/s |
(c) 2 × 10–4 m/s |
(d) 8 ×103 m/s |
The S.I. unit of radioactivity is
|
(a) Roentgen |
(b) Rutherford |
(c) Curie |
(d) Becqueral |
Photon and electron are given same energy (
. Wavelength associated with photon and electron are 
and 
then correct statement will be
|
(a) |
(b) |
(c) |
(d) |
A solid conducting sphere of radius R1 is surrounded by another concentric hollow conducting sphere of radius R2. The capacitance of this assembly is proportional to
|
(a) |
(b) |
(c) |
(d) |
