1
MHT CET 2021 24th September Morning Shift
+1
-0

A current '$$I$$' is flowing in a conductor of length '$$L$$' when it is bent in the form of a circular loop, its magnetic moment will be

A
$$\frac{\mathrm{IL}}{4 \pi^2}$$
B
$$4 \pi \mathrm{L}^2$$
C
$$\frac{4 \pi}{\mathrm{IL}^2}$$
D
$$\frac{\mathrm{IL}^2}{4 \pi}$$
2
MHT CET 2021 23th September Morning Shift
+1
-0

A bar magnet has length $$3 \mathrm{~cm}$$, cross-sectional area $$2 \mathrm{~cm}^2$$ and magnetic moment $$3 \mathrm{~Am}^2$$. The intensity of magnetisation of bar magnet is

A
$$2 \times 10^5 \mathrm{~A} / \mathrm{m}$$
B
$$3 \times 10^5 \mathrm{~A} / \mathrm{m}$$
C
$$4 \times 10^5 \mathrm{~A} / \mathrm{m}$$
D
$$5 \times 10^5 \mathrm{~A} / \mathrm{m}$$
3
MHT CET 2021 22th September Evening Shift
+1
-0

The relative permeability of iron is 2000. Its absolute permeability in SI unit will be $$\left(\frac{\mu_0}{4 \pi}=10^{-7} \text{SI unit}\right)$$

A
$$8 \pi \times 10^{-7}$$
B
$$4 \pi \times 10^{-5}$$
C
$$8 \pi \times 10^{-4}$$
D
$$\frac{500}{\pi} \times 10^{-7}$$
4
MHT CET 2021 22th September Morning Shift
+1
-0

The permeability of a metal is $$0.1256 ~\mathrm{TmA}^{-1}$$. Its relative permeability will be $$\mathrm{\left( {{{{\mu _0}} \over {4\pi }} = {{10}^{ - 7}}\,SI\,unit} \right)}$$ ($$\pi=3.14$$)

A
$$10^5$$
B
$$3 \times 10^5$$
C
$$2 \times 10^6$$
D
$$10^4$$
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