When the current in a toroidal solenoid is changing at a rate of 0.0200 A/s, the magnitude of the induced emf is 12.7 mV. When the current equals 1.50 A, the average flux through each turn of the solenoid is 0.00458 Wb. How many turns does the solenoid have?

Explanation:

From the question we are told that

    The  rate of  current change is  

    The  magnitude of the induced emf is  

     The  current is  

      The  average  flux is  

Generally the number of  turns the number of turn the solenoid has is mathematically represented as  

substituting values

the answer would be 32*f

show the wavelengths of a wave. show the crests of a wave.