## Q1 Magnetic field intensity at a point on the axial line of the magnet various with distance 'r' of the point from the center of the bar magnet as

- (a) `r^{1}`
- (b) `r^{2}`
- (c) `r^{-1}`
- (d) `r^{-3}`

- (d) `r^{-3}`

## Q2 Suppose magnetic field intensity at a distance r from the center of a short bar magnet on the axial live is B. Then magnetic field intensity at a distance r from the bisector of the bar magnet is.

- a) B
- b) 2B
- c) B/2
- d) None of these

- c) B/2

## Q3 A wire of length l has a magnetic moment m. If it is bent into a semi-circular arc, its new magnetic moment is:

- a) m/l
- b) 2M/л
- c) m
- d) M

- b) 2M/л

## Q4 If magnetic length of a bar magnet is 'x' and the geometrical length of the bar magnet is 'y', then:

- a) x = y
- b) x > y
- c) x < y
- d) None of these

- c) x < y

## Q5 SI units of magnetic dipole moment of a bar magnet are

- a) A`m^{2}`
- b) A`m^{-1}`
- c) A`m^{-2}`
- d) `A^{-1}`m

- a) A`m^{2}`

## Q6 The force between two magnetic poles is F. If the distance between the poles and pole strengths of each pole are doubled, then the force experienced is:

- a) F
- b) F/4
- c) 2F
- d) F/2

- a) F

## Q7 The dimensions of magnetic dipole moment are `M^{0}L^{2}T^{0}`I

- a) True
- b) False

- a) True

## Q8 What is the net magnetic flux through a closed surface?

- a) Positive
- b) Negative
- c) Zero
- d) Depends on the nature of the surface

- c) Zero

## Q9. ‘X’ is the product of the pole strength of either magnetic pole and the magnetic length of the magnetic dipole. Identify X.

- a) Magnetic dipole
- b) Magnetic dipole moment
- c) Magnetic pole strength
- d) Magnetic dipole length

- b) Magnetic dipole moment

## Q10 What is the torque exerted by a bar magnet on itself due to its field?

- a) Maximum
- b) Zero
- c) Minimum
- d) Depends on the direction of the magnetic field

- b) Zero,
- A bar magnet does not exert a force or torque on itself due to its field. But an element of a current-carrying conductor experiences forces due to another element of the conductor. So, the torque exerted by a bar magnet on itself is zero.

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