Physics, asked by vedeshsharma9000, 9 months ago

An electric dipole consists of two opposite charges each of magnitude 1×10^-6 C saperated by a distance 2cm. The dipole is placed in an external electric field of 10×10^5 N/C. The maximum torque on dipole is -

A. 0.2×10^-3 N-m
B. 1.0×10^-3 N-m
C. 2×10^-3 N-m
D. 4×10^-3 N-m


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Answers

Answered by mihirchavan01102005
0

Answer:

An electric dipole consist at two opposite charge each of magnitude =1μC=1×10

−6

C

distance =2cm

Exter field =10

5

N/C

maximum torque on the dipole =?

q=1×10

−6

C,2a=2cm

or, =0.02cm

∴ P=q×2a

=(1×10

−6

)×0.02

=2×10

−8

cm

Intensity of the external electric field, E=1.0×10

5

N/C

(i) Z

max

=pE=(2×10

−8

)(10×10

5

)=2×10

−3

N−m

(ii) Net work done in turning the dipole from 0

0

to 180

0

i.e W=∫

0

0

180

0

r

dθ=∫

0

0

180

0

pEsinθdθ

=pE[−cosθ]

0

0

180

0

=−pE(cos180

0

−cos0

0

)

=2pE

=2×(2×10

−8

)(1×10

5

)J

=4×10

−3

J

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