A wire solenoid with 100 total turns is bent into the shape of a torus (doughnut) having a radius $r = 5$ cm. A 730-mA current passes through the wire. The magnetic field inside the torus is
A) 5.6 mT.
B) 13 mT.
C) 0.29 mT.
D) 23 mT.

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The Answer of A wire solenoid with 100 total turns is bent into the shape of a torus (doughnut) having a radius $r = 5$ cm. A 730-mA current passes through the wire. The magnetic field inside the torus is
A) 5.6 mT.
B) 13 mT.
C) 0.29 mT.
D) 23 mT.

A Wire Solenoid with 100 Total Turns Is Bent into the Shape