Write the SI unit of (i) electric field intensity and (ii) electric dipole moment. 

(i) SI unit of electric field intensity is NC–1 (Newton per Coulomb).
(ii) SI unit of electric dipole moment is C-m (Coulomb-metre).

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Two point charges of + 3 μC each are 100 cm apart. At what point on the line joining the charges will the electric intensity be zero?

The electric intensity will be zero at a point mid-way between the two charges.
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Does the Coulomb force that one charge exerts on another changes if other charges are brought nearby?

No, the Coulomb force due to one charge is not changed.
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Define the term electric dipole moment. Is it a scalar or a vector quantity?


The product of either charge and separation between two charges is termed as electric dipole moment.
It is a vector quantity in the direction of the dipole axis from –q to +q.

p =q(2a)    or p = (q) 2 a
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Why does an ebonite rod get negatively charged on rubbing with fur?

Electrons in fur are less tightly bound than electrons in ebonite. Hence electrons are lost by fur while ebonite rod gains electrons and therefore gets negatively charged.
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