A metal detector with two coils (an exciter and a detector) is an example of an active detection system. Suppose a metallic coin (which is non-magnetic on its own, but can have a magnetic field induced by an exciter coil) is lost under the sand at the beach.Part AThe exciter coil would useelectric current. The detector coil will detect a signal from the lost coin under the sand because$E - al =an AC,atO an AC, $B · Əl = µo(I + e, E)ata DC,at$B· al = µo(1 + €oa DC,at

In metal detector , current flows through transmitter coil which produces a magnetic field.

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