Concept explainers
(a)
The magnitude and direction of magnetic force on the bob at the lowest point of the pendulum when it is released.
Answer to Problem 73PE
Explanation of Solution
Given:
A pendulum is set up so that its bob swings between the poles of permanent magnet. Charge on the bob is given as
Formula used:
The magnetic force on a charge particle having charge
Calculation:
A swinging bob of a pendulum is released from rest from height
The tangential velocity is then
Substituting the values of acceleration due to gravity
Now the force on the bob is
Substituting the values of charge on the bob
And the direction of the force is upward.
Conclusion:
When the bob of pendulum placed in the magnetic field region is released, the magnetic force on itis
(b)
The acceleration of the bob at the bottom of its swing in a magnetic field region.
Answer to Problem 73PE
Explanation of Solution
Given:
A pendulum is set up so that its bob swings between the poles of permanent magnet. Charge on the bob is given as
Formula used:
The magnetic force on a charge particle having charge
Force on a particle of mass
Calculation:
It is seen in part (a) that the magnetic force acting on the bob when it is released from height in a uniform magnetic field is
The acceleration produced in the bob is
Conclusion:
The acceleration of the bob at the bottom of its swing is
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Chapter 22 Solutions
COLLEGE PHYSICS
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