Question

Equipotential surfaces are shown in the figure. Find the magnitude and the direction of the resultant electric field.

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A

200 V/m making an angle with the positive x-axis.

B

200 V/m making an angle with the positive x-axis.

C

200 V/m making an angle with the negative x-axis.

D

100 V/m making an angle with the x-axis.

Hard
Solution
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Correct option is B)

Since, each of the equipotential surfaces are parallel to each other,
the perpendicular distance between them is given by
d 5
Now, the potential gradient between 2 consecutive planes is 10V
So, the electric field is given by, E 200
Direction of Electric field is from higher potential surface towards the lower potential surface . Hence , an Obtuse angle .

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