Questions
A ring of radius I caries a charge +q. A test charge -qo is released on its axis at a distance from its centre. How much kinetic energy will be acquired by the test charge when it reaches the centre of the ring ?
detailed solution
Correct option is B
Potential V1, due to a ring is given byV1=14πε0×qR2+r2=14πε0×aR2+3R2(∵r=3R)=14πε0×q2RAt centre V2=14πε0×qR K.E. =q0V2−V1=14πε0qq02RTalk to our academic expert!
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A half ring of radius R has charge per unit length. The potential at its centre is :
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