4 charges are placed each at a distance 'a' from origin. The dipole moment of configuration is :
2qaˆj
3qaˆj
2aq[ˆi+ˆj]
none
A
none
B
2qaˆj
C
3qaˆj
D
2aq[ˆi+ˆj]
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Solution
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As the total charge of the configuration is zero so the origin is independent of choice. Now we can find the dipole moment about given origin.
Thus, dipole moment about the origin is →p=(−2q)(a^i)+3q(a^j)+(−2q)(−a^i)+q(−a^j)=2qa^j
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