The equation of an equipotential line in...

The equation of an equipotential line in an electric field is ` y = 2 x `, then electric field strength vectro at `1, 2` may be .

A

` 4 hat I + 3 hat j`

B

` 4 hat I + 8 hat j`

C

` 8 hat I + 4 hat I + 4 hat j`

D

` - 8 hat I + 4 hat j`

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The correct Answer is:

D

Electric field will be perpendicyalr line ` y= 2x ` so it will have slope ` m =- 1/2`.

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