Question

two point charges one of 100uC and another of -400uC, are kept 30cm apart. Find the point of zero potential on the line joining the two charges

Answer 1

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Answer 2

Answer:

solution:-

Given ,

Two charge q100=+400μC

qp=100μC

q2=400μC

d=30cm=.3m

Let point P (where, f1μC=0) is at distance r from q1   [ref. image]

F1+F2=0

kr2q1×qp−k(.3−r)2q1qp=0

r2q1=(∗.−2)2q2

(r.3−r)2=q1q2=14=4