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Q.

The dipole moment of the system shown in figure is

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a

3Ql

b

5Ql

c

2Ql

d

Ql

answer is B.

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Detailed Solution

+3Q can be written as (+2Q+Q)+2Q and -2Q form a dipole whose moment is p1=2Q x 2l=4Ql(←)+Q and -Q form another dipole whose moment is p2=Q x l=Ql(←)∴p→=p1→+p2→⇒p=4Ql+Ql=5Ql

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