Question

four charges are placed at the circumference of the dial of a clock as shown in the figure. If the clock has only hour hand, then the resultant force on a positive charge q0 placed at the centre, points in the direction which shows the time as
A. 1:30
B. 7:30
C. 4:30
D. 10:30 ​

Answer 1

Answer:

Explanation:

see the attachment for answer. it's 7:30.

Answer 2

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Since the central charge q° is positively charged, it will experience repulsive force from positive charges placed at 12 and 3 in the clock and attractive forces from negative charges placed at 6 and 9.

Since all forces are equal in magnitude, the net force will be the resultant of these forces and will point in the direction between 6 and 9. As both the forces are of 2F magnitude, the resultant force will make an angle of 45° with the forces and hence it will point at the time 7.30.

Hope it helps..