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An electric dipole is placed at an alig...

An electric dipole is placed at an alignment angle of `309^@` with an electric field of `2 xx 10^5 N C^(-1)` . It experiences a torque equal to 8 Nm. The charge on the dipole if the dipole legth is 1 cm is

A

(a) 4 mC

B

(b) 8 mC

C

(c) -5 mC

D

(d) 7 mC

Text Solution

Verified by Experts

The correct Answer is:
B
`theta=30^@,E=2xx10^5NC^-1,tau=8Nm,`
`P=q xx 2d = q xx 1xx10^-2= q xx 10^-2.`
`tau = Pesintheta`
`8=qxx10^-2xx2xx10^5xxsin30^@`
`8=qxx2xx10^3xx1/2`
`q=8xx10^-3=8mC`
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