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How will the magnetic field intensity at...

How will the magnetic field intensity at the contre of a circular coil carrying current change if the current through the coil is doubled and the radius of the coil is halved ?

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Magnetic field at the centre of a circular coil
`B = (mu_(0)NI)/(2 R) `
When current I is doubled and radius R is halved, `B' =(mu_(0)N xx 2I)/(2.(R/2)) = 4B`
` :. ` magnetic field becomes four times the original field.
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