1.

Two current carrying coil having radius 'r' are seperated by distance 'd' as shown in diagram. Ifrlt ltd. Then find the force between two ring. Current in both the ring is clockwise and equal to i.

Answer»

`(6mu_(0))/(4pi)(i^(2)pi^(2)R^(4))/(d^(4))`
`(mu_(0))/(4pi)(i^(2)pi^(2)r^(4))/(d^(4))`
`(3mu_(0))/(4pi)(i^(2)pi^(2)r^(4))/(d^(4))`
`(mu_(0))/(2pi)(i^(2)pi^(2)r^(4))/(d^(4))`

Solution :`f=mu(dB)/(dx)`
`B=(2mu_(0)M)/(4pid^(3)) implies (dB)/(DD)=-(6mu_(0)M)/(4pid^(4))`
`F=M_(1)M_(2)[-(6mu_(0))/(4pid^(4))]=-(6)/(4pi)(mu_(0)M_(1)M_(2))/(d^(4))`
`-(6mu_(0)(pir^(2)i)(pi^(2)i))/(4pid^(4))`


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