Question

3. (3 pts) A square loop of side a carrying a constant current lo is centered in a long solenoid of radius so > a and with n coils per meter. The ends of the solenoid wires are attached in a closed circuit with resistance R. The loop is rotating with constant angular frequency on an axis perpendicular to the axis of the solenoid (and passing through the axis of the solenoid). a. Find the torque τ required to keep the loop rotating at angular frequency ω, b. What happens to the required torque when R0? Explain physically why this makes sense. Show explicitly that ωτave-120 R/2, where In0 the amplitude of the current in c. torque. Argue based on g principles of power that this must be the case (hint, in mechanics, what does a) physically represent?)

Answer 1

spe ven data Suave havst side. a s a curve tue looP liven data, whew R0 oleveid

ven data LN Sivce due. to otat on of looP altesnate soduced FOX 才-.--max 1 2 2