Question

(a) A wire with current i= 1.3 A is shown. Two semi-infinite straight sections, both tangent to the same circle, are connected by a circular arc that has a central angle θ and runs along the circumference of the circle. The arc and the two straight sections all lie in the same plane. If B=0 at the circle’s center, what is θ in rads?

(b) The force on a wire carrying 3.3 A

is a maximum of 7.3 N

when placed between the pole faces of a magnet. If the pole faces are 1.2 cm

in diameter, what is the strength of the magnetic field in Tesla?

Answer 1