| Directions (Q. No. 1 - 8): In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as. |
| Assertion (A): In a non-uniform electric field, a dipole will have translatory as well as rotatory motion. |
| Reason (R): In a non-uniform electric field, a dipole experiences a force as well as torque. |
A) Both A and R are true and R is the correct explanation of A
B) Both A and R are true but R is NOT the correct explanation of A
C) A is true but R is false
D) A is false and R is
Correct Answer: A
Solution :
| Option [a] is correct. |
| Explanation: When an electric dipole is placed in a uniform electric field at an angle 9 with the field, the dipole experiences a torque. |
| The torque produced by two parallel forces acting as couple =\[\tau \] |
| \[\tau =qE(2l\sin \theta )\] |
| In case of non-uniform field, force acting on both the ends of the dipole will not be equal. |
| So, there will be a combination of couple and a net force. In this way, dipole will have both rotational as well as linear motion. |
| So, both assertion and reason are true. Reason also explains the assertion. |
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