1
BITSAT 2022
+3
-1

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 at speed v. The magnetic force on the particle when it passes through the centre has a magnitude.

A
$${{qv{\mu _0}I} \over {2\pi r}}$$
B
$$qv{{{\mu _0}I} \over {\pi r}}$$
C
$${{qv{\mu _0}I} \over r}$$
D
0
2
BITSAT 2021
+3
-1

Two particles A and B of masses mA and mB respectively, are having same charge and moving on same plane. A uniform magnetic field exists perpendicular to this plane. The speeds of the particles are vA and vB respectively and the trajectories are as shown in figure. Then,

A
mA = mB and vA = vB
B
mAvA > mBvB
C
mA < mB and vA < vB
D
mAvA < mBvB
3
BITSAT 2020
+3
-1

What is the magnitude of the force experienced per unit length by a thin wire that carries a current of I = 10 A and is formed into a semi-circle with a radius of R = 20$$\pi$$ cm at a point O?

A
30 $$\mu$$N/m
B
40 $$\mu$$N/m
C
50 $$\mu$$N/m
D
60 $$\mu$$N/m
EXAM MAP
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