Magnetism and Matter Test

Result

Magnetism and Matter Test - 16

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Weekly Quiz Competition

Question 1
4 / -1

Magnetic field intensity due to a dipole varies as dⁿ, where n is equal to

A
2

B
–2

C
3

D
–3
Question 2
4 / -1

A closely wound solenoid of 800 turns has area of cross section 2.5 cm². Magnetic moment associated with it, when it carries a current of 3A is

A
0.6 JT^–1

B
0.06 JT^–1

C
6 JT^–1

D
none of these

Solution
Question 3
4 / -1

The magnet of pole strength m and magnetic moment M is cut into two pieces along its axis. Its pole strength and magnetic moment now become

A

B

C

D
Question 4
4 / -1

Two magnets of equal magnetic moments M each are placed as shown in Fig. The resultant magnetic moment is

A
M

B
√3M

C
√2M

D
M/2

Solution
Question 5
4 / -1

What is the resultant magnetic moment of two magnets, each of magnetic moment M in the following figures?

A
√2M; zero, √3M; zero

B
√2M; zero; zero; √3M

C
√2M;√3M; zero, zero

D
None of the above

Solution
Question 6
4 / -1

The distance between the poles of a horse shoe magnet is 4 cm. the pole strength of each pole is 40 units. The magnetic potential midway between the poles is

A
80 units

B
10 units

C
20 units

D
zero

Solution
Question 7
4 / -1

The magnet A (pole strength m) of mass M kg floats on the top of another identical magnet B as shown in Fig. The vertical distance between the two magnets is d metre. The balance condition is achieved due to:

A
the absence of gravitational force on A

B
the predominance of repulsive force due to B

C
superconductivity

D
the balancing of downward gravitational force on A with the upward repulsive force from B
Question 8
4 / -1

A dip circle is so set that its needle moves freely in the magnetic meridian. In this position, the angle of dip is 40^o. Now the dip circle is rotated so that the plane in which the needle moves makes an angle of 30^o with the magnetic meridian. In this position, the needle will dip by an angle

A
40º

B
30º

C
more than 40º

D
less than 40º

Solution
Question 9
4 / -1

Aurora Borealis is a luminous electrical discharge in the upper layers of the atmosphere, which is visible more frequently in

A
polar regions

B
equator

C
lunar eclipse

D
regions of earth’s magnetic poles
Question 10
4 / -1

Earth’s magnetic field always has a horizontal component except at

A
equator

B
magnetic pole

C
a latitude of 60º

D
an inclination of 60º