Question

In the figure, a charged sphere of mass m
and charge q starts sliding from rest on a
vertical fixed circular track of radius R from
the position shown in the figure. There
exists an uniform and constant horizontal
magnetic field of induction B. The
maximum force exerted by the track on
the sphere is

Answer 1

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Question From class 12 Chapter SOURCE AND EFFECT OF MAGNETIC FIELD

In the figure a charged small sphere of mass

and the charge

starts sliding from rest on a vertical fixed circular smooth track of radius

from the position

shown.

.

Answer 2

Explanation:

The net force acting on he ball is

N - mgsin∝ - Bqv = mv²/r

Here the angle will be maximum at ∝ = π/2 and Vmax = √(2rg)

F = mg + Bq √(2rg) + m x 2rg /r

   = 3 mg + √(2rg) Bq

Hope you understand

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