Two tiny spheres carrying charges `1.8 muC and 2.8 mu C` are located at 40 cm apart. The potential at the mid-point of the line joining the two charges is

Options

A. `3.8 xx 10^(4) V`
B. `2.1 xx 10^(5)V`
C. `4.3 xx 10^(4)V`
D. `3.6 xx 10^(5) V`

Answer

B

Explanation

`V = (1)/(4p in_(0)) ((q_(1))/(r_(1)) + (q_(2))/(r_(2)))`