A long, ideal solenoid has a diameter d=12cm and n=1200turns/meter carrying current I=20A. If the current is lowered at 4.33amp/s to zero, what is the magnitude of the induced electric field in V/m at a position 8.2cm from the solenoid's axis (so at a point outside the solenoid)?
hi, use this link as a formula ,go to the examples and find your question ,
phys.nthu.edu.tw/~thschang/notes/GP31.pdf