Magnetism and Matter Test

Result

Magnetism and Matter Test - 25

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Weekly Quiz Competition

Question 1
4 / -1

Rate of change of torque τ with deflection θ is maximum for a magnet suspended freely in a uniform magnetic field of induction B, when

A
θ = 0^oN

B
θ = 45^oN

C
θ = 60^oN

D
θ = 90^oN

Solution
Question 2
4 / -1

A magnet of magnetic moment M is rotated through 360° in a magnetic field H. The work done will be

A
MH

B
2MH

C
2πMH

D
Zero

Solution
Question 3
4 / -1

The work done in turning a magnet of magnetic moment ‘M’ by an angle of 90° from the meridian is \'n\' times the corresponding work done to turn in through an angle of 60°, where \'n\' is given by

A
1/2

B
2

C
1/4

D
1

Solution
Question 4
4 / -1

Force between two identical bar magnets whose centres are r metre apart is 4.8 N, when their axes are in the same line. If separation is increased to 2r, the force between them is reduced to

A
2.4 N

B
1.2 N

C
0.6 N

D
0.3 N

Solution
Question 5
4 / -1

A bar magnet of magnetic moment 10⁴J/T is free to rotate in a horizontal plane. The work done in rotating the magnet slowly from a direction parallel to a horizontal magnetic field of 4 × 10^–5 T to a direction 60° from the field will be

A
0.2 J

B
2.0 J

C
4.18 J

D
2 × 10²J

Solution
Question 6
4 / -1

Magnetic lines of force due to a bar magnet do not intersect because

A
A point always has a single net magnetic field

B
The lines have similar charges and so repel each other

C
The lines always diverge from a single point

D
The lines need magnetic lenses to be made to intersect
Question 7
4 / -1

A permanent magnet

A
Attracts all substances

B
Attracts only magnetic substances

C
Attracts magnetic substances and repels all non-magnetic substances

D
Attracts non-magnetic substances and repels magnetic substances
Question 8
4 / -1

Two equal bar magnets are kept as shown in the figure. The direction of resultant magnetic field, indicated by arrow head at the point P is (approximately)

A

B

C

D

Solution
Question 9
4 / -1

A short bar magnet placed with its axis at 30o with a uniform external magnetic field of 0.16 tesla experiences a torque of magnitude 0.032 joule. The magnetic moment of the bar magnet will be

A
0.23 joule/tesla

B
0.40 joule/tesla

C
0.80 joule/tesla

D
Zero

Solution
Question 10
4 / -1

The magnetic field due to a small magnetic dipole of magnetic moment M, at distance r from the centre on the equatorial line is given by (in M.K.S. system)

A

B

C

D

Solution