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Two point charges +4q and +q are placed ...

Two point charges `+4q` and `+q` are placed 30 cm apart. The electric field intensity at a point on the line joining the two charges is zero. The point is situated at a distance

A

15 cm from 4q

B

20 cm from 4q

C

7.5 cm from q

D

5 cm from q

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