Consider an infinitely long solenoid with N turns per unit length radius R and carrying current 1 t a cos wt where a is a

Question

Consider an infinitely long solenoid with N turns per unit length radius R and carrying current 1 t a cos wt where a is a constant and wo is the angular frequency The magnitude of electric field at the surface of the solenoid is A HONRwa sin wt C ONRwa sin wt B HowNR cos wit D HowNR cos wt

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