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Principle of Superposition

Four charges ...

Question

Four charges are placed at the circumference of dial clock as shown in figure. If the clock has only hour hand, then the resultant force on a positive charge $q_{0}$ placed at the centre, points in the direction which show the time as:

A

1 : 30

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B

7 : 30

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C

4 : 30

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D

10 : 30

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Solution

The correct option is B $7 : 30$
Since the electric force is in the direction towards the negative charges so the direction of forces due to the charges will be as shown in the figure.
The resultant force direction will indicate the times 7.30

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