Q.

Fig. shows an electric dipole. A point charge 4 μC is placed on the axial line of dipole at a large distance from the centre of dipole where electric field strength due to dipole is I 00 N/C. The dipole is also present in the electric field of 4 μC charge. Assuming that the charges that make the dipole are fixed relative to each other, but the dipole, as a whole, is free to move :

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a

4 μC charge experiences a force 4 x 10-4 N to the left; the dipole experiences no force but it experiences a torque

b

4 μC charge experiences a force 4 x 10-4 N to the left; the dipole experiences a force 4 x 10-4 N to the right but it experiences no torque

c

4 μC charge experiences a force 4 x 10-4 N to the left; the dipole experiences a force 4 x 10-4 N to the right, it also experiences a torque that will rotate it anticlockwise

d

4 μC charge experiences a force 4 x 10-4 N to the left; the dipole experiences no force and no torque

answer is B.

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Detailed Solution

Use Newton's Ill rd law.
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