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Two infinite line-charges parallel to ea...

Two infinite line-charges parallel to each other are moving with a constant velocity v in the same direction as shown in the figure. . The separation between two line-charges is d. The magnetic attraction balances the electric repulsion when, [c = speed of light in space]

A

`v=sqrt2c`

B

`v=c/sqrt2`

C

`v=c`

D

`v=c/2`

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