# Charge Q  = 10 $\mu C$ is distributed over a circumference of ring of radius 3 m alng x-y plane with centre at origin. Find electric potenetial at point (0,0,4) . Option 1) 1.8 X 104 V Option 2) 0 Option 3) 1.8 V Option 4) 1.4 X 108 V

V Vakul

As we learnt ,

If x>>R -

$\dpi{100} E=\frac{kQ}{x^{2}}$  ,  $\dpi{100} V=\frac{kQ}{x}$

-

$V = \frac{kQ}{R } \; \; \; R = \sqrt{3^{2}+4^{2}} = 5 m$

$q = 10 \times 10^{-6} = 10^{-5} C$

$V = \frac{9 \times 10 ^{9} \times 10^{-5}}{5} = 1.8 \times 10 ^{4}V$

Option 1)

1.8 X 104 V

Option 2)

0

Option 3)

1.8 V

Option 4)

1.4 X 108 V

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