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Exam
NEET
Subject
Physics
Chapter
Electrostatics

NEET · Physics · Electrostatics

An electric dipole is situated in an electric field as shown in...

An electric dipole is situated in an electric field as shown in figure. The dipole and electric field are both in the plane of paper. The dipole is rotated about an axis, perpendicular to the paper at point AA in anti-clockwise direction. If the angle of rotation is measured with respect to the direction of the electric field, then the torque for different values of the angle of rotation (\theta) is correctly represented by which graph among a,b,c,da, b, c, d given in Fig (b)(b) ? An electric dipole is situated in an electric field as shown in figure. The dipole and electric field are both in the
An electric dipole is situated in an electric field as shown in figure. The dipole and electric field are both in the

Options

  1. A(a)
  2. B(c)
  3. C(b)
  4. D(d)

Correct answer

C. (b)

Step-by-step solution

Torque on electric dipole placed in uniform electric field EE is given as (\tau=p E \sin θ\theta) ...(i) where, p=p= electric dipole moment and (θ=\theta=) angle measured with respect to direction of electric field. From Eq. (i), When (θ=\theta=0^{{}^{\circ}} \Rightarrow \tau=p E \sin 0^{{}^{\circ}}=0) When (θ=π2⇒τ=\theta=\frac{\pi}{2} \Rightarrow \tau=p E \sin π2=\frac{\pi}{2}=p E) When (θ=π⇒τ=\theta=\pi \Rightarrow \tau=p E \sin π=\pi=0) When (θ=3π2⇒τ=\theta=\frac{3 \pi}{2} \Rightarrow \tau=p E \sin 3π2=−\frac{3 \pi}{2}=-p E) When (θ=\theta=2 π⇒τ=\pi \Rightarrow \tau=p E \sin 2 π=\pi=0) Hence, graph between (\tau) and (θ\theta) is given as An electric dipole is situated in an electric field as shown in figure. The dipole and electric field are both in the
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