Question

# Two charges 4q and q are placed 30 cm apart. At what point, the value of electric field will be zero?

A
10 cm away from q and between the charges.
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B
20 cm away from q and between the charges.
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C
15 cm away from q and between the charges.
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D
25 cm away from q and between the charges.
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Solution

## The correct option is A 10 cm away from q and between the charges.At equilibrium, net field at point P is zero. E1−E2=0 ⇒k(4q)(x×10−2)2=kq[(30−x)×10−2]2 On solving this, we get, x=20 cm Therefore, net electric field is zero at (30−x) cm=(30−20) cm=10 cm away from q and between the charges.

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