- ATo detect presence of charge on a body.
- BTo determine the nature of charge on a body.
- CTo measure the exact amount of charge on a body.
- DFor both A and B.
Explanation:
Electroscope is a device which is use to detect whether a body is carrying charge and also to detect the nature of charge on the body.
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Two resistance wires on joining in parallel the resultant resistance is . One of the wire breaks, the effective resistance is 2 ohms. The resistance of the broken wire is
|
(a) |
(b) 2 ohm |
(c) |
(d) 3 ohm |
A particle has a mass 400 times than that of the electron and charge is double than that of a electron. It is accelerated by 5V of potential difference. Initially the particle was at rest, then its final kinetic energy will be
|
(a) 5 eV |
(b) 10 eV |
(c) 100 eV |
(d) 2000 eV |
A beam of electrons is moving with constant velocity in a region having electric and magnetic fields of strength
and 0.5 T at right angles to the direction of motion of the electrons. What is the velocity of the electrons
|
(a) 20 |
(b) 40 |
(c) 8 |
(d) 5.5 |