Two point charges Q and −Q/4 placed along the x-axis are separated by a distance r. Take −Q/4 as origin and it is placed at the right of Q. Then the potential is zero.
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a
at x = r/3 only
b
at x=−r/5 only
c
both at x=r/3 and x=−r/5
d
there exist two points on the axis where the electric field is zero
answer is C.
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Detailed Solution
kQ4x1=kQr+x1 or r+x1=4x1 or x1=r3or kQ4x2=kQr−x2 or x2=r5