﻿ Two thin dielectric slabs of dielectric constants K1 and K2 (K1 < K2) are inserted between plates of a parallel plate capacitor, as shown in the figure. The variation of electric field E between the plates with distance d as measured from plate P is correctly shown by: | Electric Charges and Fields

## Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

## Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

## Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.

# Electric Charges and Fields

#### Multiple Choice Questions

1.

The electric field in a certain region is acting radially outward and is given by E = Ar. A charge contained in a sphere of radius 'a' centred at the origin of the field will be given by

1875 Views

2.

In a coil of resistance 10Ω, the induced current developed by changing magnetic flux through it is shown in the figure as a function of time. The magnitude of change in flux through the coil in weber is

• 8

• 2

• 6

• 6

439 Views

3.

What is the flux through a cube of side a if a point charge of q is a one of its corner?

818 Views

# 4.Two thin dielectric slabs of dielectric constants K1 and K2 (K1 < K2) are inserted between plates of a parallel plate capacitor, as shown in the figure. The variation of electric field E between the plates with distance d as measured from plate P is correctly shown by:

B.

The electric field inside the dielectrics will be less than the electric field outside the dielectrics. The electric field inside the dielectric could not be zero.

As K2 > K1 the drop in electric field for K2 dielectric must be more than K1.

1893 Views

5.

A conducting sphere of radius R is given a charge Q. The electric potential and the electric field at the centre of the sphere respectively are:

• zero and

683 Views

6.

In a region, the potential is represented by V (x,y,z) = 6x - 8 xy - 8y + 6yz, where V is in volts and x, y, z are in metres. The electric force experienced by a charge of 2 coulomb situated at point (1,1,1) is,

• 6√5 N

• 30 N

• 24 N

• 24 N

2066 Views

7.

A charge Q is enclosed by a Gaussian spherical surface of radius R. If the radius is doubled, then the outward electric flux will

• be reduced to half

• remain the same

• be doubled

• be doubled

450 Views

8.

A beam of cathode rays is subjected to crossed Electric (E)  and magnetic field (B). The fields are adjusted such that the beam is not deflected. The specific charge of the cathode rays is given by

(Where V is the potential difference between cathode and anode)

• B2/2VE2

• 2VB2/E2

• 2VE2/B2

• 2VE2/B2

1946 Views

9.

The square surface of side L metre in the plane of the paper is placed in a uniform electric field E (volt/m) acting along the same place at angle θ with the horizontal side of the square as shown in the figure. The electric flux linked to the surface in unit of V-m is

• EL2

• EL2 cos θ

• EL2 sin θ

• EL2 sin θ

836 Views

10.

The electric field at a distance 3R/2 from the centre of a charged conducting spherical shell of radius R is E. The electric field at a distance R/2 from the centre of the sphere is

• zero

• E

• E/2

• E/2

903 Views