﻿ Medical Entrance Exam Question and Answers | Electric Charges and Fields - Zigya

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# Electric Charges and Fields

#### Multiple Choice Questions

21.

The charges on two spheres are + 7 µC and -5C respectively. They experience a force F. If each of them is given an additional charge of -2 µC, then the new force of attraction will

• F

• $\frac{\mathrm{F}}{2}$

• $\frac{\mathrm{F}}{\sqrt{3}}$

• 2F

22.

A square loop ABCD, carrying a current I2, is placed near and coplanar with a long straight conductor XY carrying a current I1, as shown in figure. The net force on the loop will be 23.

Three identical charges are placed at the vertices of an equilateral triangle. The force experienced by each charge, ( if k = 1/4 ) is

24.

The angle of dip at a certain place where the horizontal and vertical components of the earth's magnetic field are equal is

• 30o

• 75o

• 60o

• 45o

25.

Assertion:  Lines of force are perpendicular to conductor surface.

Reason:  Generally electric field is perpendicular to equipotential surface.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

26.

The force per unit length between two straight conductors separated by a distance of 0.02 m is 2 x 10-3 N m-1. The current in one conductor is 10 A and that in the other conductor is

• 20 A

• 5 A

• 2 A

• 10 A

27.

The angle of dip at the poles and the equator respectively are

• 30o, 60o

• 0o, 90o

• 45o, 90o

• 90o, 0o

28.

Assertion:  The conductivity of an electrolyte is very low as compared to a metal at room temperature.

Reason:  The number density of free ions in electrolyte is much smaller as compared to the number density of free electrons in metals. Further, ions drift much more slowly, being heavier.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

29.

A particle of charge q and mass m starts moving from the origin under the action of an electric field $\stackrel{\to }{\mathrm{E}}$ = E0$\stackrel{^}{\mathrm{i}}$  and  velocity  . The speed of the particle will become  after a time

30.

Assertion:  Magnetic lines forms closed loops in nature.

Reason: Mono-magnetic pole does not exist in nature.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.