1
COMEDK 2022
MCQ (Single Correct Answer)
+1
-0

An electric current $I$ enters and leaves a uniform circular wire of radius $r$ through diametrically opposite points. A charged particle $$q$$ moves along the axis of circular wire passes through its centre with speed $$v$$. The magnetic force on the particle when it passes through the centre has a magnitude

A
$$\frac{q v \mu_0 I}{2 \pi r}$$
B
$$q v \frac{\mu_0 I}{\pi r}$$
C
$$\frac{q v \mu_0 I}{r}$$
D
$$0$$
2
COMEDK 2022
MCQ (Single Correct Answer)
+1
-0

A regular hexagon of side $$m$$ which is a wire of length 24 m is coiled on that hexagon. If current in hexagon is $$I$$, then the magnetic moment,

COMEDK 2022 Physics - Moving Charges and Magnetism Question 16 English

A
$$6\sqrt3~Im^2$$
B
$$3\sqrt3~Im^2$$
C
$$\frac{3\sqrt3}{2}~Im^2$$
D
$$6~Im^2$$
3
COMEDK 2021
MCQ (Single Correct Answer)
+1
-0

Two particles of masses $$m_1=m,m_2=2m$$ and charges $$q_1=q,q_2=2q$$ entered into uniform magnetic field. Find $$F_1/F_2$$ (force ratio).

A
$$\frac{1}{2}$$
B
$$1$$
C
$$\frac{1}{3}$$
D
$$2$$
4
COMEDK 2021
MCQ (Single Correct Answer)
+1
-0

A long solenoid has 20 turns cm$$^{-1}$$. The current necessary to produce a magnetic field of 20 mT inside the solenoid is approximately

A
1A
B
2A
C
4A
D
8A
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