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19. How will the magnetic field intensity at thecentre of a circular coil carrying current changeif the current through the coil is doubled and theradius of the coil is halved ?

Answer»

We all know , magnetic field in a coil is directly proportional to the current and in versely proportinal to radius

thefore if current is doubled and radius is halved them magnetic field will increase . it will be 4 times the initial magnetic field



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