1
COMEDK 2021
MCQ (Single Correct Answer)
+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.
2
COMEDK 2021
MCQ (Single Correct Answer)
+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$$^{7}$$
3
COMEDK 2020
MCQ (Single Correct Answer)
+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
$$m_p/r$$
4
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

The angle which the total magnetic field of earth makes with the surface of the earth is called

A
declination
B
magnetic meridian
C
geographic meridian
D
inclination
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