Question

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Answer 1

For point charge

E=V/r

Given

V=15J/C

E=30N/C

Distance from point charge, r=?

Point charge, q=?

r=V/E=15/30=0.5m

V=

4πε

0

r

q

q=4πε

0

rV

q=

9×10

9

1

×0.5×15

q=0.83×10

−9

C

q=0.83nC