1
MHT CET 2023 10th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

The magnetic field at the centre of a circular coil of radius '$$R$$', carrying current $$2 A$$ is '$$B_1$$'. The magnetic field at the centre of another coil of radius '$$3 R$$' carrying current $$4 A$$ is '$$B_2$$'. The ratio $$B_1:B_2$$ is

A
$$1: 2$$
B
$$2: 1$$
C
$$2: 3$$
D
$$3: 2$$
2
MHT CET 2023 10th May Evening Shift
MCQ (Single Correct Answer)
+1
-0

Two wires $$2 \mathrm{~mm}$$ apart supply current to a $$100 \mathrm{~V}, 1 \mathrm{~kW}$$ heater. The force per metre between the wires is ( $$\mu_0=4 \pi \times 10^{-27}$$ SI unit)

A
$$2 \times 10^{-2} \mathrm{~N}$$
B
$$4 \times 10^{-3} \mathrm{~N}$$
C
$$2 \times 10^2 \mathrm{~N}$$
D
$$10^{-2} \mathrm{~N}$$
3
MHT CET 2023 10th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

Two long parallel wires carrying currents $$8 \mathrm{~A}$$ and $$15 \mathrm{~A}$$ in opposite directions are placed at a distance of $$7 \mathrm{~cm}$$ from each other. A point '$$\mathrm{P}$$' is at equidistant from both the wires such that the lines joining the point to the wires are perpendicular to each other. The magnitude of magnetic field at point '$$\mathrm{P}$$' is $$(\sqrt{2}=1.4) ( \mu_0=4 \pi \times 10^{-7}$$ SI units)

A
$$68 \times 10^{-6} \mathrm{~T}$$
B
$$48 \times 10^{-6} \mathrm{~T}$$
C
$$32 \times 10^{-6} \mathrm{~T}$$
D
$$16 \times 10^{-6} \mathrm{~T}$$
4
MHT CET 2023 10th May Morning Shift
MCQ (Single Correct Answer)
+1
-0

Electron of mass '$$\mathrm{m}$$' and charge '$$\mathrm{q}$$' is travelling with speed '$$v$$' along a circular path of radius '$$R$$', at right angles to a uniform magnetic field of intensity '$$B$$'. If the speed of the electron is halved and the magnetic field is doubled, the resulting path would have radius

A
$$4 \mathrm{R}$$
B
$$2 \mathrm{R}$$
C
$$\frac{\mathrm{R}}{2}$$
D
$$\frac{\mathrm{R}}{4}$$
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