550 questions across 1 question group — pick any mix to generate a Physics paper with step-by-step answer keys.
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
An electron (charge = 1.6 × 10–19 coulomb) is moving in a circle of radius 5.1 × 10–11m at a frequency of 6.8 × 1015 revolutions/sec. The equivalent current is approximately
|
(a) 5.1 |
(b) 6.8 |
(c) 1.1 |
(d) 2.2 |
Two wires of equal diameters, of resistivities 
and 
and lengths l1 and l2, respectively, are joined in series. The equivalent resistivity of the combination is
|
(a) |
(b) |
(c) 
|
(d) 
|
The resistances of a wire at temperatures t℃ and 0℃ are related by
|
(a) |
(b) |
(c) |
(d) |
A wire 100 cm long and 2.0 mm diameter has a resistance of 0.7 ohm, the electrical resistivity of the material is
|
(a) 4.4 |
(b) 2.2 |
|
(c) 1.1 |
(d) 0.22 |
There is a current of 20 amperes in a copper wire of 
square metre area of cross-section. If the number of free electrons per cubic metre is 
, then the drift velocity is
|
(a) 125 |
(b) 12.5 |
(c) 1.25 |
(d) 1.25 |
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