JEE Physics · 160 questions. Try each one, then check the answer and solution.
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Q41.AI-generated practiceSingle-correct MCQEasy
Charges of +2 nC and −2 nC are separated by 3 mm. The magnitude of the dipole moment is:
Q42.AI-generated practiceSingle-correct MCQEasy
The direction of the electric dipole moment vector is:
Q43.AI-generated practiceSingle-correct MCQMedium
For a short electric dipole, the ratio of the magnitude of the field at a point on its axis to that at a point on its equatorial line, both at the same large distance r, is:
Q44.AI-generated practiceSingle-correct MCQMedium
A dipole of moment 4 × 10-9 C m is placed in a uniform field of 5 × 104 N/C with its axis at 30° to the field. The torque on it is:
Q45.AI-generated practiceSingle-correct MCQMedium
The work required to rotate an electric dipole slowly from the stable equilibrium position to the unstable equilibrium position in a uniform field E is:
Q46.AI-generated practiceSingle-correct MCQMedium
An electric dipole is placed in a uniform electric field. Which statement is correct?
Q47.AI-generated practiceSingle-correct MCQHard
An electric dipole is placed along the x-axis with its moment along +x in a non-uniform field E = E(x) î whose magnitude increases with x. The dipole experiences:
Q48.AI-generated practiceSingle-correct MCQEasy
At a large distance r from an electric dipole, the electric field varies as:
Q49.AI-generated practiceSingle-correct MCQMedium
A dipole of moment 2 × 10-8 C m makes an angle of 60° with a uniform field of 1 × 105 N/C. Its potential energy is:
Q50.AI-generated practiceSingle-correct MCQHard
A short dipole of moment 2 × 10-9 C m is in air. The magnitude of its electric field at a point 10 cm from its centre on the equatorial line is (1/(4πε0) = 9 × 109 N m2 C-2):
Q51.AI-generated practiceSingle-correct MCQHard
An electric dipole of moment p and moment of inertia I is slightly displaced from its stable position in a uniform field E. The time period of its small oscillations is:
Q52.AI-generated practiceSingle-correct MCQMedium
A short dipole lies at the origin with its moment p along the +x axis. At a point on the +y axis, the electric field due to the dipole points:
Q53.AI-generated practiceSingle-correct MCQEasy
An electric dipole is placed in a uniform electric field with its dipole moment parallel to the field. The dipole is in:
Q54.AI-generated practiceSingle-correct MCQHard
The electric field of a short dipole at a point on its axis at distance r is E. The field at a point on its equatorial line at distance 2r is:
Q55.AI-generated practiceNumerical valueEasy
A dipole of moment 5 × 10-9 C m is placed in a uniform field of 2 × 105 N/C. If the maximum torque it can experience is x × 10-4 N m, find x.
Q56.AI-generated practiceNumerical valueMedium
A dipole of moment 4 × 10-9 C m is turned slowly from the direction of a uniform field of 5 × 104 N/C to a direction perpendicular to it. If the work done is x × 10-5 J, find x.
Q57.AI-generated practiceNumerical valueMedium
A short dipole has moment 6 × 10-9 C m. Take 1/(4πε0) = 9 × 109 N m2 C-2. If the magnitude of its field at a point on its axis 30 cm from its centre is x × 103 N/C, find x.
Q58.AI-generated practiceNumerical valueHard
A dipole in a uniform field is rotated slowly first from θ = 0° to θ = 60°, and then from θ = 60° to θ = 180° (θ is the angle between p and E). Find the ratio of the work done in the second rotation to that in the first.
Q59.AI-generated practiceAssertion–ReasonMedium
Assertion (A): An electric dipole placed in a uniform electric field experiences no net force. Reason (R): The forces on the two charges of the dipole are equal in magnitude and opposite in direction.
Q60.AI-generated practiceAssertion–ReasonHard
Assertion (A): The electric field of a dipole at a point on its equatorial line is parallel to the dipole moment. Reason (R): On the equatorial line, the field components perpendicular to the dipole axis due to the two charges cancel.