Question

A 310 turn solenoid with a length of19.0 cm and a radius of 1.70 cmcarries a current of 1.70 A. A second coil of four turns is wrappedtightlyaround this solenoid, so it can be considered to have thesameradius as the solenoid. The current in the 310 turn solenoidincreases steadily to 5.00 A in0.900 s.

(a) Use Ampere's law to calculate theinitialmagnetic field in the middle of the 310turn solenoid.
1T

(b) Calculate the magnetic field of the 310 turn solenoid after0.900 s.
2T

(c) Calculate the area of the 4-turn coil.
3m²

(d) Calculate the change in the magnetic flux through the4-turncoil during the same period.
4
Your response differs from the correct answerby orders ofmagnitude. Wb

(e) Calculate the average induced emf in the 4-turn coil.
5
Your response differs from the correct answerby 10% to 100%.V

for d I keep getting 6.8e-2Tm2, it's supposedtobe in Wb I know, but is 6.8 even right?