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Question

Three small spheres each carrying a positive charge q are placed on the circumference of a circle of radius r to form an equilateral triangle. The electric field at the centre of the circle is :


A
3qr2
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B
3qr
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C
q2(qr2)
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D
zero
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Solution

The correct option is D zero
The electric field at the centre by
E=kqr2
The three electric fields are equal in magnitude and at 1200 to each other.
The Net E at centre is zero
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