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Q.

An electric dipole is placed at an angle of 300with an electric field intensity 2×105 NC-1. It experiences a torque equal to 4 Nm. The charge on the dipole, if the dipole length is 2cm

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a

8 mC

b

2 mC

c

5 mC

d

2μC

answer is B.

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Detailed Solution

Here, θ=30°,E=2×105 NC-1τ=4 N m,l=2 cm=0.02 mq=?τ=pEsinθ=(ql)Esinθ∴q=τElsinθ=42×105×0.02×12=42×103=2×10-3C=2mC

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An electric dipole is placed at an angle of 300with an electric field intensity 2×105 NC-1. It experiences a torque equal to 4 Nm. The charge on the dipole, if the dipole length is 2cm