charges q,q,-2q are placed at the corners of equilateral triangle of side l. what is the net dipole moment?

Ans root3 ql.

pl explain

Arjit Raj, 13 years ago

Grade:

5 Answers

vikas askiitian expert

509 Points

13 years ago

let A,B,C are three vertices ...

charge at A,B is q but at C charge is -2q ...

A(q) ...................B(q)

C(-2q)

charge of C can be written as -q + -q

q charge of A & -q charge of C becomes 1 dipole ...

q charge of B & another -q charge of C makes another dipole ..

direction of dipole moments of both is rowards C .....

angle bw them will be 60^o ...

now resultant = root(p²+p²+2p²cos60^o) = root3 (P)

now , P = qL so resultant = root3(qL)

anu gupta

20 Points

11 years ago

the answer of the question :the resultant dipole moment of 3 charges placed at the vertices of the triangle is root3qL or -root3 qL

Arpit

11 Points

8 years ago

Explanation given by vikas is correct.

Except that “Direction of dipole is from negative to positive.” then only its answer will “root(3)ql”.

Otherwise if “direction of dipole moments of both is towards C …..” it will be in negative j-direction,since it is a vector quantity.

Therefore answer will become “-root3(ql)”

| A(Q)-------------------B(Q)

|
|

| C(-2Q)

|----------------------------------->X

Pran

11 Points

6 years ago

Dipole is only an applicable condition when and only when the charges are also equal in magnitude rather than only being opposite.So, 1st we break -2q charge at C as -q +(-q).Now there are 2 -q charges at C i.e. 1 to complete dipole with A and another with B.Now,Dipole due AC=dipole due BC = q.aSo net dipole = vector sum dipole due AC and due BC where angle b\w the 2 vectors =60°So net dipole=√(qa)²+(qa)²+2qacos60° =√3qa

Yash Chourasiya

askIITians Faculty 256 Points

3 years ago

Dear Student

Consider an equilateral triangle of side l. Point A and B have charges +q where A has -2q charge. The system as two dipoles with P₁and P₂ along BA and CA respectively. Hence, the magnitude of P₁ and P₂ are equal to (ql) and the angle between them is 60°. Therefore, the resultant of two is the net dipole moment.