A cavity of radius r is made inside a solid sphere. The volume charge density of the remaining sphere is ρ. An electron (charge e, mass m) is released from rest inside the cavity from point P as shown in figure. The centre of sphere and centre of cavity are separated by a distance a. The time after which the electron again touches the sphere is–
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
The electron will move opposite to electronic field with constant acceleration along shown horizontal line of length
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