and are the magnetic fields at the centre of two coils and respectively each carrying equal current. If coil has 200 turns and radius and coil . has 400 turns and radius, the ratio of and is :
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So, when radius is tripled, magnetic field becomes 9 times.
Charge is uniformly spread on a thin ring of radius . The ring rotates about its axis with a uniform frequency : The magnitude of magnetic induction at the centre of the ring is
Magnetic field at the centre of the ring is .
A current ampere flows in a circular arc of wire which subtends an angle radians at its centre, whose radius is . The magnetic field at the centre is
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