COMEDK 2022 | Magnetism and Matter Question 9 | Physics

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

0.75 A-m$$^{2}$$

0.25 A-m$$^{2}$$

0.50 A-m$$^{2}$$

1.50 A-m$$^{2}$$

COMEDK 2021

MCQ (Single Correct Answer)

-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?

Motion remains simple harmonic with time period 4T.

Motion remains simple harmonic with time period nearly constant.

Motion remains simple harmonic and time period becomes T/2.

Motion remains simple harmonic with time period 2T.

COMEDK 2021

MCQ (Single Correct Answer)

-0

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

5999

6001

6000 $$\times$$ 10$$^{-7}$$

6000 $$\times$$ 10$$^{7}$$

COMEDK 2020

MCQ (Single Correct Answer)

-0

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

$$m_p/r^2$$

$$m_p r^2$$

$$r^2/m_p$$

$$m_p/r$$

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