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A cavity of radius r is made inside a so...

A cavity of radius r is made inside a solid sphere. The volume charge density of the remaining sphere is p An electron (charge e, mass m) is released 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 ` sqrt((sqrt(n) xepsi_(0)m)/(e0a)) ` find n.

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RESONANCE ENGLISH-ELECTROSTATICS-Part- II
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