1
COMEDK 2022
+1
-0

A bar magnet of length $$6 \mathrm{~cm}$$, is placed in the magnetic meridian with $$N$$ pole, pointing towards the geographical north. Two neutral points, separated by a distance of $$8 \mathrm{~cm}$$ are obtained on the equitorial axis of the magnet. If $$B_H=1.2 \times 10^{-5} \mathrm{~T}$$. Then the pole strength of the magnet is

A
0.75 A-m$$^{2}$$
B
0.25 A-m$$^{2}$$
C
0.50 A-m$$^{2}$$
D
1.50 A-m$$^{2}$$
2
COMEDK 2021
+1
-0

A bar magnet is oscillating in the earth's magnetic field with a period T. What happens to its period and motion, if its mass is quadrupled?

A
Motion remains simple harmonic with time period 4T.
B
Motion remains simple harmonic with time period nearly constant.
C
Motion remains simple harmonic and time period becomes T/2.
D
Motion remains simple harmonic with time period 2T.
3
COMEDK 2021
+1
-0

The relative permeability of iron is 6000. Its magnetic susceptibility is

A
5999
B
6001
C
6000 $$\times$$ 10$$^{-7}$$
D
6000 $$\times$$ 10$$^{7}$$
4
COMEDK 2020
+1
-0

The intensity of magnetic field due to an isolated pole of strength $$m_p$$ at a point distant $$r$$ from it will be

A
$$m_p/r^2$$
B
$$m_p r^2$$
C
$$r^2/m_p$$
D
$$m_p/r$$
EXAM MAP
Medical
NEET