A clock dial has point charges 
at the positions of the corresponding numbers on the dial respectively. The time at which the hour's hand points the direction of the net electric field at the center of the dial is (Assume clock hands do not influence the net electric field)
Text Solution
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Electric field is given by 
Charge is more then electric field is also more.
The magnitude of two vector and their resultant is same then the angle between them is 
.
Starting from E 1 , the other vector for which the difference in angle is 
with E 1 would be E 5 . The resultant of these vectors would be in the direction of E 3 having magnitude is 2E.
Similarly for E 2 .
Since, E 3 and E 4 represents -10q and -9q on the clock, their bisector would indicate a time of 
.
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