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Potential at a Point Due to a Dipole

a circular ri...

Question

a circular ring of radius r is placed in xy plane with its centre at the origin,if the linear charge density is lambda=lamdacoso where 0* is the angle which the line joining any point of circumference and centre makes with +x axis,then the direction of E at centre of ring is?

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R

x - y

x < 0

+ λ C/m

x > 0

- λ C/m

(

volts)

P

(0 m, + R / 2 m)

λ

q = 10 m C

3 m

P (0, 0, 4 m)

λ = λ_{0} sin θ

λ = λ_{0} cos θ

θ

r >> R

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a circular ring of radius r is placed in xy plane with its centre at the origin,if the linear charge density is lambda=lamda*coso* where 0* is the angle which the line joining any point of circumference and centre makes with +x axis,then the direction of E at centre of ring is?