Questions
Three identical dipoles are arranged as shown below. What will be the net electric field at
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a
k⋅px3
b
2kpx3
c
zero
d
2kpx3
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Correct option is C
Point P lies at equatorial positions of dipole 1 and 2 and axial position of dipole 3.due to dipoles 1E1=k.px3 (towards left) due to dipole 2E2=k⋅px3 (towards left) due to dipole 3E3=k⋅(2p)x3 (towards right) Net electric field=E1+E2-E3=k⋅(p)x3+k⋅(p)x3-k⋅(2p)x3=0So net field at P will be zero.
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The electric field at a point on equatorial line of a dipole and direction of the dipole moment
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