Free Printable Electric charges and fields -DPP1 (ISC )

1.

Relative permittivity of water is 81. If $\epsilon_w\ and\ \epsilon_0$ are permittivites of water and vacuum respectively, then:

a)

$\epsilon_0=9\epsilon_w$

b)

$\epsilon_0=81ϵ_w$

c)

$\epsilon_w=9\epsilon_0$

d)

$\epsilon_w=81\epsilon_0$

2.

In the absence of other conductors, the surface charge density

a)

Is proportional to the charge on the conductor and its surface area

b)

Inversely proportional to the charge and directly proportional to the surface area

c)

Directly proportional to the charge and inversely proportional to the surface area

d)

Inversely proportional to the charge and the surface area

3.

a)

$-q$

b)

$-2q$

c)

$-\frac{q}{2}$

d)

$4q$

4.

a)

1 : 8

b)

– 8 : 1

c)

1 : 2

d)

– 2 : 1

5.

a)

$E_{A\ }>E_B$

b)

$E_{A\ }<E_B$

c)

$E_A=\frac{E_{B\ \ }}{r}$

d)

$E_{A\ }=\frac{E_{B\ }}{r^2}$

6.

An uncharged sphere of metal is placed in between two charged plates as shown. The lines of force look like

a)

A

b)

B

c)

C

d)

D

7.

In the figure the charge Q is at the centre of the circle. Work done is maximum when another charge is taken from point P to

a)

K

b)

L

c)

M

d)

N

8.

Two unlike charges of magnitude q are separated by a distance 2d . The potential at a point midway between them is

a)

Zero

b)

$\frac{1}{4\pi\epsilon_o}$

c)

$\frac{1}{4\pi\epsilon_o}\ \frac{q}{d}$

d)

$\frac{1}{4\pi\epsilon_o}\frac{2q}{d^2}$

9.

If q is the charge per unit area on the surface of a conductor, then the electric field intensity at a point on the surface is

a)

$\frac{q}{\epsilon_o}$ normal to surface

b)

$\frac{q}{2\epsilon_o}$ normal to surface

c)

$\frac{q}{\epsilon_o}$ tangential to surface

d)

$\frac{q}{2\epsilon_o}$ tangential to surface

10.

a)

$12\times10^{-1\ }Nm$

b)

$12\times10^{-3\ }Nm$

c)

$24\times10^{-1\ }Nm$

d)

$24\times10^{-3\ }Nm$

Electric charges and fields -DPP1 (ISC )

Total questions: 10

Worksheet time: 10mins

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