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Two opposite and equal chrages 4 xx 10^(...

Two opposite and equal chrages `4 xx 10^(-8)` coulomb when placed `2 xx 10^(-2) cm` away, from a dipole. If dipole is placed in an ecternal electric field `4 xx 10^(8)` newton//coulomb, the value of maximum torque and the work done in rotating it through `180^(@)` will be

A

`32xx10^(-4)Nm` and `32xx10^(-4)J`

B

`64xx10^(-4)Nm` and `64xx10^(-4)J`

C

`64xx10^(-4)Nm` and `32xx10^(-4)J`

D

`16xx10^(-4)Nm` and `32xx10^(-4)J`

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particles moves in a direction where potential energy of the system decreased.
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