Question

You design a solenoid for magnetic resonance imaging. The solenoid is 1.8 m long and 75 cm in diameter. It is tightly wound with a single layer of 2 mm diameter superconducting wire (i.e. there is no gap between adjacent windings).

a) What current is needed to generate a 1.5 T magnetic field?

b) You accelerate protons across a potential difference of 30 kV and inject them (through a small gap between the wires) at an angle of 90° with respect to the axis of the solenoid. They will follow a semi-circular path. What is the radius of the path?

Answer 1