physics : class12 Parallel dipole orientation : Torque on an Electric Dipole : Electrostatics MCQ Questions and Answers
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Parallel dipole orientation
MCQ questions and answers.
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MCQ Questions
1. An electric dipole is placed parallel to a uniform electric field. What is the angle between the dipole moment and the electric field?
A.
0°
B.
45°
C.
90°
D.
180°
Correct Answer:
0°
Explanation:
When an electric dipole is parallel to the electric field, its dipole moment points in the same direction as the field, so the angle is 0°.
2. What is the torque on an electric dipole placed parallel to a uniform electric field?
A.
pE
B.
pE/2
C.
Zero
D.
2pE
Correct Answer:
Zero
Explanation:
The torque on a dipole is given by τ = pE sin θ. For parallel orientation, θ = 0°, so sin 0° = 0 and the torque is zero.
3. An electric dipole has dipole moment p and is placed parallel to an electric field E. Which expression gives its torque?
A.
pE
B.
pE sin 0°
C.
pE cos 0°
D.
p/E
Correct Answer:
pE sin 0°
Explanation:
For a dipole, τ = pE sin θ. Since the dipole is parallel to the field, θ = 0°, so the torque is pE sin 0°, which equals zero.
4. When an electric dipole is oriented parallel to a uniform electric field, the dipole experiences:
A.
Maximum torque
B.
Zero torque
C.
Torque equal to pE
D.
Torque equal to E/p
Correct Answer:
Zero torque
Explanation:
A parallel dipole has an angle of 0° with the field. Therefore, τ = pE sin 0° = 0.
5. A dipole is aligned in the same direction as a uniform electric field. What happens to its rotational tendency?
A.
It is maximum
B.
It is zero
C.
It becomes equal to pE
D.
It becomes infinite
Correct Answer:
It is zero
Explanation:
The rotational tendency is measured by torque. For a dipole parallel to the field, the torque is zero because the angle between p and E is zero.
6. For an electric dipole parallel to a uniform electric field, which statement is correct?
A.
The torque tends to rotate it further in the same direction
B.
The torque is zero
C.
The torque is always maximum
D.
The torque is independent of the dipole moment
Correct Answer:
The torque is zero
Explanation:
In the parallel orientation, τ = pE sin θ with θ = 0°. Hence, no torque acts to rotate the dipole.
7. If the dipole moment of an electric dipole is 3 C m and it is parallel to an electric field of 2 N/C, what is its torque?
A.
0 N m
B.
1.5 N m
C.
5 N m
D.
6 N m
Correct Answer:
0 N m
Explanation:
Since the dipole is parallel to the field, θ = 0°. Thus, τ = pE sin 0° = 0 N m, regardless of the values of p and E.
8. An electric dipole in a uniform electric field has zero torque. Which orientation can produce this condition in the parallel case?
A.
Dipole moment perpendicular to the field
B.
Dipole moment parallel to the field
C.
Dipole moment at 45° to the field
D.
Dipole moment at 60° to the field
Correct Answer:
Dipole moment parallel to the field
Explanation:
For the parallel orientation, the angle is 0° and τ = pE sin 0° = 0. Thus, the torque is zero.
9. In the parallel orientation of an electric dipole, the positive end of the dipole points:
A.
Opposite to the electric field
B.
Perpendicular to the electric field
C.
In the direction of the electric field
D.
In a random direction
Correct Answer:
In the direction of the electric field
Explanation:
The dipole moment is directed from the negative charge to the positive charge. In parallel orientation, the dipole moment and the electric field point in the same direction.
10. What is the value of sin θ for an electric dipole placed parallel to a uniform electric field?
A.
0
B.
1/2
C.
1
D.
√3/2
Correct Answer:
0
Explanation:
For a parallel dipole, θ = 0°. Therefore, sin θ = sin 0° = 0, making the torque zero.
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