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Question

Two print charges $$ q_1 = +2.40 n C $$ and $$ q_2 = -6.50 nC $$ are 0.100 m apart. point A is midway between them ; point B is 0.080 m form $$q_1 $$ and 0.060 m from $$ q_2 $$ as shown in fig. take the electric potential to be zero at infinity .
The potential at point B is

A
-738 V
B
-323 V
C
-705 V
D
-120 V
Solution
Verified by Toppr

Correct option is C. -705 V
Electric Potential:
At $$ B : V_B = k ( \dfrac {q_1}{r_1} +\dfrac {q_2}{r_2})$$
$$ = k(\dfrac {2.40 \times 10^{-9} C}{0.08m} + \dfrac { -6.50 \times 10^{-9} C}{0.06 m} ) = -705 V $$

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