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Q.

Two point charge q1=4μC and q2=9μC are placed 20cm apart. The electric field due to them will be zero on the line joining them at a distance of

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a

8cm from q1

b

8cm form q2

c

8013cm from q1

d

8013cm from q2

answer is A.

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Detailed Solution

Ep=0 ⇒4x2=9(20−x)2 ⇒20−xx=32 ⇒40−2x=3x ⇒x=8cm
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Two point charge q1=4μC and q2=9μC are placed 20cm apart. The electric field due to them will be zero on the line joining them at a distance of