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A coil of radius r = 25 cm wound of a thin copper wire of length l = 500 m rotates with an angular velocity ω = 300 rad/s about its axis. The coil is connected to a ballistic galvanometer by means of sliding contacts. The total resistance of the circuit is equal to R = 21 Ω. Find the specific charge of current carriers in copper if a sudden stoppage of the coil makes a charge q = 10 nC flow through the galvanometer.

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In a rotating frame, to first order in ω, the main effect is a coriolis force  This unbalanced force will cause electrons to react by setting up a magnetic field vector B that the magnetic force  balances the coriolis force.

where  is the number of turns of the ring. If ω changes (and there is time for the electron to rearrange) then B also changes and so does Φ. An emf will be induced and a current will flow. This is

The total charge flowing through the ballastic galvanometer, as the ring is stopped, is

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