Question 742: Electrostatics & Capacitance

Question

An electric dipole is placed at an angle of 30
o
with an electric field intensity 2 $ 	imes $ 10
5
N C
$-$1
. It experiences a torque equal to 4 N m. The charge on the dipole, if the dipole length is 2 cm, is

Accepted Answer

Torque is given by ÃÂ = pE sin ÃÂ¸
ÃÂ = pE sin ÃÂ¸ = q$l$E sinÃÂ¸
$ \Rightarrow $ q = ÃÂ /$l$E sinÃÂ¸
= 4/(2 ÃÂ 10
-2
ÃÂ 0.5 ÃÂ 2 ÃÂ 10
5
) = 2 mC

Answer

8 mC

Answer

2 mC

Answer

5 mC

Answer

7 $\mu $C

Electrostatics & Capacitance

An electric dipole is placed at an angle of 30 o with an electric field intensity 2 \times 10 5 N C -1 . It experiences a torque equal to 4 N m. The charge on the dipole, if the dipole length is 2 cm, is

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