Chap#14 Electromagnetism

Question 1

A volteter has resistance of 2000 ohms and it can measure up to 2V. If we want to increase its range to 10V then required resistance tin series will be:

Answer 1

8000 Ω

Question 2

If a diamagnetic substance is brought near north or south pole of a bar magnetic it is:

Answer 2

Repelled by the poles

Question 3

A moving charge wll gain energy due to the application of:

Answer 3

Electric Field

Question 4

The unit of elecric current ‘ampere’ is the amount o current flowing through each of two parallel wires 1m apart and of infinite length will give rise to a force between them equal to:

Answer 4

2 x 10^-7 N/m

Question 5

The incorrect statement regarding the lines of force of the magnetic field B is:

Answer 5

Inside a magnet, its magnetic lines of force move from north pole of a magnet towards its south pole

Question 6

Choose the correct statement:

Answer 6

An ammeter should have small resistance and a voltmeter should have large resistance

Question 7

The magnetic moment of a circular coil carrying current is:

Answer 7

Directly proportional to the square of the length of the wire in the coil

Question 8

Shunt required in an ammeter of resistance R to decrease its deflection from 30 ampere to 10 ampere is:

Answer 8

R/2

Question 9

Which of the following particles would experience the largest magnetic force when projected with the same velocity perpendicular to a magnetic field?

Answer 9

Li+

Question 10

If in a moving coil galvanometer a current I produces a deflection Θ, then

Answer 10

i ∝ tan Θ