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Understanding Electrostatic Potential

A metallic sp...

Question

A metallic sphere of radius R1 carries a charge Q,another uncharged metallic sphere of radius R2 is connected to it using a long wire of negligible resistance. Find the charge transferred from first to second sphere

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Solution

charge will flow until attain same potential
and
v=k Q/R

there fore
v1=v2
kq1/r1 = kq2/r2
q2=q1 r2 / r1

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