1
MHT CET 2021 20th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

The magnetic field at the centre of a current carrying circular coil of area 'A' is 'B'. The magnetic moment of the coil is ( $$\mu_0=$$ permeability of free space)

A
$$\frac{2 \mathrm{BA}^{3 / 2}}{\mu_0 \sqrt{\pi}}$$
B
$$\frac{\mathrm{BA}^{3 / 2}}{\mu_0 \pi}$$
C
$$\frac{\mu_0 \sqrt{\pi}}{2 \mathrm{BA}^2}$$
D
$$\frac{2 \mathrm{BA}^2}{\mu_0 \sqrt{\pi}}$$
2
MHT CET 2021 20th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

A galvanometer has resistance '$$\mathrm{G}$$' $$\Omega$$ and '$$\mathrm{I}_{\mathrm{g}}$$' is current flowing through it which produces full scale deflection. '$$\mathrm{S}_1$$' is the value of shunt which converts it into an ammeter of range 0 to '$$3 \mathrm{I}$$' and '$$\mathrm{S}_2$$' is the shunt value which converts it into an ammeter of range 0 to '$$4 \mathrm{I}$$', the ratio $$\mathrm{S}_2: \mathrm{S}_1$$ is

A
$$\frac{4}{3}$$
B
$$\frac{3 \mathrm{I}-\mathrm{I}_{\mathrm{g}}}{4 \mathrm{I}-\mathrm{I}_{\mathrm{g}}}$$
C
$$\frac{3}{4}$$
D
$$\frac{4 I-I_g}{3 I-I_g}$$
3
MHT CET 2021 20th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

In potentiometer experiment, null point is obtained at a particular point for a cell on potentiometer wire '$$\mathrm{x}$$' cm long. If length of potentiometer wire is increased by few centimeter without changing the cell, the balancing length will [Driving source is not changed]

A
will net change.
B
increase
C
decrease
D
become zero
4
MHT CET 2021 20th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

A hollow charged metal sphere has radius 'R'. If the potential difference between its surface and a point at a distance '5 R' from the centre is $$\mathrm{V}$$, then magnitude of electric field Intensity at a distance '5R' from the centre of sphere is

A
$$\frac{V}{2 R}$$
B
$$\frac{\mathrm{V}}{20 \mathrm{R}}$$
C
$$10 \mathrm{VR}$$
D
$$20 \mathrm{VR}$$
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