1
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
$$\frac{\mu_0 q}{2 \pi f R}$$
2
MHT CET 2021 22th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

A particle having a charge $$100 \mathrm{e}$$ is revolving in a circular path of radius $$0.8 \mathrm{~m}$$ with 1. r.p.s The magnetic field produced at the centre of the circle in SI unit is $$\left(\mu_0=\right.$$ permeability of vacuum, $$e= \left.1.6 \times 10^{-19} \mathrm{C}\right)$$

A
$$10^{-17} \mu_0$$
B
$$10^{-3} \mu_0$$
C
$$10^{-7} \mu_0$$
D
$$10^{-11} \mu_0$$
3
MHT CET 2021 22th September Evening Shift
MCQ (Single Correct Answer)
+1
-0

The magnetic field inside a current carrying toroidal solenoid is $$0.2 \mathrm{~mT}$$. What is the magnetic field inside the toroid if the current through it is tripled and radius is made $$\frac{1}{3}^{\text {rd}}$$ ?

A
0.2 mT
B
0.6 mT
C
0.8 mT
D
0.9 mT
4
MHT CET 2021 22th September Morning Shift
MCQ (Single Correct Answer)
+1
-0

When a battery is connected to the two ends of a diagonal of a square conductor frame of side '$$a$$', the magnitude of magnetic field at the centre will be ( $$\mu_0=$$ permeability of free space)

A
$$\frac{\mu_0}{\sqrt{2} \pi \mathrm{a}}$$
B
$$\frac{\sqrt{2} \mu_0}{\pi \mathrm{a}}$$
C
$$\frac{\mu_0}{\pi \mathrm{a}}$$
D
zero
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