An electric dipole of moment p is lying along a uniform electric field E. The work done in rotating the dipole by 180° is

Question

An electric dipole of moment p is lying along a uniform electric field E. The work done in rotating the dipole by 180° is (A) √2 pE (B) pE (C) 2 pE (D) ( pE /√2)

Tardigrade Admin · Accepted Answer

W =p E( cos θ1- cos θ2) W =p E( cos 0°- cos 180°) W =p E(1-(-1))=2 p E

Q. An electric dipole of moment $p$ is lying along a uniform electric field $E$ . The work done in rotating the dipole by $18 0^{\circ}$ is

$2 pE$

$pE$

$2 pE$

$\frac{pE}{2}$

$W = pE (cos θ_{1} - cos θ_{2})$
$W = pE (cos 0^{\circ} - cos 18 0^{\circ})$
$W = pE (1 - (- 1)) = 2 pE$

Q. An electric dipole of moment p is lying along a uniform electric field E. The work done in rotating the dipole by 180∘ is

2​pE

pE

2pE

2​pE​

W=pE(cosθ1​−cosθ2​) W=pE(cos0∘−cos180∘) W=pE(1−(−1))=2pE

Q. An electric dipole of moment $p$ is lying along a uniform electric field $E$ . The work done in rotating the dipole by $18 0^{\circ}$ is

$2 pE$

$pE$

$2 pE$

$\frac{pE}{2}$

$W = pE (cos θ_{1} - cos θ_{2})$
$W = pE (cos 0^{\circ} - cos 18 0^{\circ})$
$W = pE (1 - (- 1)) = 2 pE$