Question
Two protons exerts a nuclear force on each other, the distance between them is
|
(a) |
(b) |
(c) |
(d) |
✓
Answer
(a) 
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An example of a diamagnetic substance is
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(a) Aluminium |
(b) Copper |
(c) Iron |
(d) Nickel |
A flat circular disc has a charge +Q uniformly distributed on the disc. A charge +q is thrown with kinetic energy E towards the disc along its normal axis. The charge q will
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(a) Hit the disc at the centre |
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(b) Return back along its path after touching the disc |
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(c) Return back along its path without touching the disc |
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(d) Any of the above three situations is possible depending on the magnitude of E |
The sum of all electromagnetic forces between different particles of a system of charged particles is zero:
- Only if all the particles are positively charged.
- Only if all the particles are negatively charged.
- Only if half the particles are positively charged and half are negatively charged.
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Dimensions of $\frac{1}{(\mu_0\in_0)}$ is:
→-
$\frac{\text{L}}{\text{T}}$
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$\frac{\text{T}}{\text{L}}$
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$\frac{\text{L}^2}{\text{T}^2}$
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$\frac{\text{T}^2}{\text{L}^2}$
A pellet carrying charge of 0.5 coulombs is accelerated through a potential of 2,000 volts. It attains a kinetic energy equal to
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(a) 1000 ergs |
(b) 1000 joules |
(c) 1000 kWh |
(d) 500 ergs |
A sphere of radius R has a uniform distribution of electric charge in its volume. At a distance x from its centre, for x < R, the electric field is directly proportional to
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(a) |
(b) |
(c) x |
(d) |
When the object has no electric charge then the object is said to be:
In order to coincide the parabolas formed by singly ionised ions in one spectrograph and doubly ionized ions in the other Thomson’s mass spectrograph, the electric fields and magnetic fields are kept in the ratios 1 : 2 and 3 : 2 respectively. Then the ratio of masses of the ions is
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(a) 3 : 4 |
(b) 1 : 3 |
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A parallel combination of two resistors, of 1W each, is connected in series with a 1.5 W resistor. The total combination is connected across a 10 V battery. The current flowing in the circuit is
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(a) 5 A |
(b) 20 A |
(c) 0.2 A |
(d) 0.4 A |