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Charges 5 muC and 10 muC are placed 1 ...

Charges `5 muC` and `10 muC` are placed 1 m. apart. Work done to bring these charges at a distance 0.5 m. from each other is .......

A

`9 xx 10^4 J`

B

`18 xx 10^4 J`

C

`45 xx 10^(-2) J`

D

`9 xx 10^(-1) J`

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