Free Printable Magnetism and Matter

1.

The earth behaves as a magnet with magnetic field pointing approximately from the geographic

a)

(a) North to South

b)

(b) South to North

c)

(c) East to West

d)

(d) West to East

2.

Which of the following independent quantities is not used to specify the earth’s magnetic field?

a)

(a) Magnetic declination (θ).

b)

(b) Magnetic dip (δ).

c)

(c) Horizontal component of earth’s field (B_H).

d)

(d) Vertical component of earth’s field (B_V).

3.

Magnetic moment for solenoid and corresponding bar magnet is

a)

(a) equal for both

b)

(b) more for solenoid

c)

(c) more for bar magnet

d)

(d) none of these

4.

If Mis magnetic moment and B is magnetic field intensity, then the torque is given by

a)

(a)

b)

(b)

c)

(c)

d)

(d)

5.

Angle of dip is 90° at

a)

(a) poles.

b)

(b) equator.

c)

(c) both at equator and poles.

d)

(d) tropic of cancer.

6.

A large magnet is broken into two pieces so that the lengths are in the ratio 2:1.the pole strength of the two pieces will have ratio

a)

2 : 1

b)

1:2

c)

4:1

d)

1:1

7.

the value of angle of dip is zero at the magnetic equator because on it

a)

V and H are equal

b)

V and H are zero

c)

V is zero

d)

H is zero

8.

If you place the North pole of a magnet next to the South pole of another magnet, they will:

a)

Attract

b)

Repel

c)

Do nothing

d)

Shatter

9.

2 ways to increase the magnetic force of an electro-magnet

a)

Increase the current flow, reduce the number of coils

b)

Increase the voltage, decrease the number of coils

c)

Increase the number of coils and the current flow

d)

Spread out the coils, replace iron core with rubber.

10.

What does the following represent?
⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙
⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙
⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙⊙

a)

A crowd with binoculars

b)

A bunch of coaxial cables

c)

Uniform magnetic field directed into the screen away from you

d)

Uniform magnetic field directed out of your screen at you

11.

What does the following represent?
⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗
⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗
⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗⊗

a)

Multiplied by a billion

b)

A piece of modern art

c)

Uniform magnetic field directed into the screen away from you

d)

Uniform magnetic field directed out of your screen at you

12.

What is a solenoid?

a)

A coil of wire with current flowing through it

b)

A type of bar magnet

c)

A single straight wire

d)

One loop of a wire

13.

The correct expression for the magnetic filed at a pint P on the axial point of a circular coil is

a)

$B=\ \frac{\mu_oIR^2}{2\left(x^2+R^2\right)^{\frac{3}{2}}}$

b)

$B=\ \frac{\mu_oIR^2}{2\left(x^2-R^2\right)^{\frac{3}{2}}}$

c)

$B=\ \frac{\mu_oR^2}{2I\left(x^2+R^2\right)^{\frac{3}{2}}}$

d)

$B=\ \frac{\mu_oIR^2}{2\left(x^2+R^2\right)^{\frac{1}{2}}}$

14.

The correct expression for the magnitude of magnetic field at far Equatorial point of the bar magnet (r>>a) is given by

a)

$B=\ \frac{\mu_o}{4\pi}\ \frac{2m}{r^{2\ }}$

b)

$B=\ \frac{\mu_o}{4\pi}\ \frac{m}{r^{3\ }}$

c)

$B=\ \frac{\mu_o}{4\pi}\ \frac{2m}{r^{3\ }}$

d)

$B=\ \frac{\mu_o}{2\pi}\ \frac{2m}{r^{3\ }}$

15.

Magnetic moment of an electron is

a)

$\frac{eh}{4\pi m}$

b)

$\frac{eh}{2\pi m}$

c)

$\frac{eh2}{2\pi m}$

d)

$\frac{eh2}{4\pi m}$

Magnetism and Matter

Total questions: 15

Worksheet time: 4hrs 45mins

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