Use Ampere’s Law for solenoids to calculate the value of B inside. The solenoid has 600 turns, a length of 15 cm, and is carrying a current of 5.0 A.
The same solenoid is pulled from either end, like a slinky, so that its coils move further apart. If the new density of turns is n = 10 turns/cm, how long is this stretched solenoid? What will the new Bfield become?