An electric dipole, consisting of two opposite charges of 2 × 10-6 C each separated by a distance 3 cm is placed in an electric field of 2 × 105 N/C. Torque acting on the dipole is

Question

An electric dipole, consisting of two opposite charges of 2 × 10-6 C each separated by a distance 3 cm is placed in an electric field of 2 × 105 N/C. Torque acting on the dipole is (A) 12 × 10-1 N m  (B) 12 × 10-2 N m  (C) 12 × 10-3 N m  (D) 12 × 10-4 N m

Tardigrade Admin · Accepted Answer

Charges (q) = 2 × 10-6 C, Distance (d) = 3 cm = 3 × 10-2 m and electric field (E) = 2 × 105 N/C. Torque (τ) = q.d. E =(2 × 10-6) × (3 × 10-2) × (2 × 105) = 12 × 10-3 Nm

Q. An electric dipole, consisting of two opposite charges of $2 \times 1 0^{- 6} C$ each separated by a distance 3 cm is placed in an electric field of $2 \times 1 0^{5} N / C$ . Torque acting on the dipole is

$12 \times 1 0^{- 1} N m$

$12 \times 1 0^{- 2} N m$

$12 \times 1 0^{- 3} N m$

$12 \times 1 0^{- 4} N m$

Charges $(q) = 2 \times 1 0^{- 6} C$ , Distance (d)
$= 3 c m = 3 \times 1 0^{- 2} m$ and electric field (E)
$= 2 \times 1 0^{5} N / C$ . Torque ( $τ$ ) = q.d.
$E = (2 \times 1 0^{- 6}) \times (3 \times 1 0^{- 2}) \times (2 \times 1 0^{5})$
$= 12 \times 1 0^{- 3} N m$

Q. An electric dipole, consisting of two opposite charges of 2×10−6C each separated by a distance 3 cm is placed in an electric field of 2×105N/C. Torque acting on the dipole is

12×10−1Nm

12×10−2Nm

12×10−3Nm

12×10−4Nm