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Two electric dipoles of moment p and 64p...

Two electric dipoles of moment `p` and `64p` are placed in opposite direction on a line at a distance of `25 cm`. The electric field will be zero at point between the dipoles whose distance from the dipole of moment `p` is

A

5 cm

B

`(25)/9 cm`

C

10 cm

D

`4/13` cm

Text Solution

Verified by Experts

The correct Answer is:
A

Since, `E_p = 0`
`implies E_(p1) = E_(p2)`
`implies1/(4piepsilon_0) .(2p)/x^3 =1/(4pi epsilon_0).(2(64p))/((25-x)^3)`
`implies (25 -x)/x =4 implies 25 - x = 4x implies x = 5 cm`
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