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Two point charges +4uC and -6uC are separated by a distance of 20 cm in air. At what point on the line joining the two charges from charge +4 uC the electric potential will be zero?
Asked by harinderamit1234 | 27 Jun, 2019, 09:18: PM
answered-by-expert Expert Answer
Let at r cm from +4μC charge , potential is zero.
 
Then we have,  begin mathsize 14px style 4 over r minus fraction numerator 6 over denominator 20 minus r end fraction space equals space 0 space............ left parenthesis 1 right parenthesis end style
By solving eqn.(1) for r, we get r = 8 cm
Answered by Thiyagarajan K | 27 Jun, 2019, 09:34: PM
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