1
MHT CET 2023 9th May Evening Shift
+1
-0

A thin rod of length $$L$$ has magnetic moment $$M$$ when magnetised. If rod is bent in a semicircular arc what is magnetic moment in new shape?

A
$$\frac{M}{L}$$
B
$$\frac{M}{\pi}$$
C
$$\frac{\mathrm{M}}{2 \pi}$$
D
$$\frac{2 \mathrm{M}}{\pi}$$
2
MHT CET 2023 9th May Morning Shift
+1
-0

The materials suitable for making electromagnets should have

A
high retentivity and high coercivity
B
low retentivity and low coercivity
C
high retentivity and low coercivity
D
low retentivity and high coercivity
3
MHT CET 2022 11th August Evening Shift
+1
-0

The magnetic susceptibility of the material of a rod is 349 and permeability of vacuum $$\mu_0$$ is $$4 \pi \times 10^{-7}$$ SI units. Absolute permeability of the material of the rod in SI units is

A
$$4400 \times 10^{-7}$$
B
$$4200 \times 10^{-7}$$
C
$$4800 \times 10^{-7}$$
D
$$4600 \times 10^{-7}$$
4
MHT CET 2021 24th September Evening Shift
+1
-0

Two bar magnets '$$\mathrm{P}$$' and '$$\mathrm{Q}$$' are kept in uniform magnetic field '$$\mathrm{B}$$' with magnetic moments '$$\mathrm{M_P}$$' and '$$\mathrm{M_Q}$$' respectively. Magnet 'P' is oscillating with frequency twice that of magnet 'Q'. If the moment of inertia of the magnet 'P' is twice that of magnet 'Q' then

A
$$\mathrm{M}_{\mathrm{Q}}=2 \mathrm{M}_{\mathrm{P}}$$
B
$$\mathrm{M_P=2 M_Q}$$
C
$$\mathrm{M}_{\mathrm{P}}=8 \mathrm{M}_Q$$
D
$$\mathrm{M}_{\mathrm{Q}}=8 \mathrm{MP}_{\mathrm{P}}$$
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