1
MHT CET 2021 23rd September Evening Shift
MCQ (Single Correct Answer)
+1
-0

A long solenoid carrying current $$\mathrm{I}_1$$ produces magnetic field $$\mathrm{B}_1$$ along its axis. If the current is reduced to $$20 \%$$ and number of turns per $$\mathrm{cm}$$ are increased five times then new magnetic field B$$_2$$ is equal to

A
$$\mathrm{B}_1$$
B
$$\frac{B_1}{5}$$
C
$$5 \mathrm{B}_1$$
D
$$0.25 \mathrm{B}_1$$
2
MHT CET 2021 23rd September Evening Shift
MCQ (Single Correct Answer)
+1
-0

A straight wire of diameter $$0.4 \mathrm{~mm}$$ carrying a current of $$2 \mathrm{~A}$$ is replaced by another wire of 0.8 $$\mathrm{mm}$$ diameter carrying the same current. The magnetic field at distance $$(\mathrm{R})$$ from both the wires is 'B$$_1$$' and 'B$$_2$$' respectively. The relation between B$$_1$$ and B$$_2$$ is

A
$$B_1=\frac{B_2}{2}$$
B
$$B_1=B_2$$
C
$$\mathrm{B}_1=2 \mathrm{~B}_2$$
D
$$\mathrm{B}_1=\frac{\mathrm{B}_2}{3}$$
3
MHT CET 2021 23th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

An electron is projected along the axis of circular conductor carrying current '$$\mathrm{I}$$' The electron will experience

A
a force perpendicular to axis
B
a force along the axis
C
a force at angle $$30^{\circ}$$ with the axis
D
no force
4
MHT CET 2021 23th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

A thin ring of radius '$$R$$' meter has charge '$$q$$' coulomb uniformly spread on it. The ring rotates about its axis with a constant frequency of $$f$$ revolution/s. The value of magnetic induction in $$\mathrm{Wb} \mathrm{m}^{-2}$$ at the center of the ring is ($$\mu_0=$$ Permeability of free space)

A
$$\frac{\mu_0 \mathrm{qf}}{2 \pi \mathrm{R}}$$
B
$$\frac{\mu_0 q}{2 \pi R}$$
C
$$\frac{\mu_0 q f}{2 R}$$
D
$$\frac{\mu_0 q}{2 \pi f R}$$
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