Neon12
Oct2-10, 07:01 PM
1. The problem statement, all variables and given/known data
A 120-turn coil of radius 1.8cm and resistance 5.3 ohms is placed outside a long solenoid of smaller radius. If the central solenoid has 220 turns/cm, carries a current of 1.5A and has a radius of 1cm, determine the current which appears in the outer coil as a function of time if the current in the inner solenoid drops uniformly from 1.5A to 0A in 0.025s.
2. Relevant equations
Magnetic Flux = Φ = surface integral of B dot dA
M = [(Number of turns)*(Φ due to 1 on 2)]/current due to 1
emf2 = -M*(di1/dt)
3. The attempt at a solution
??? not sure how to make the current a function of time and incorporate into the solution, also I am confused as to why I only have a turns per cm for the inside solenoid and I have an exact number of turns for the outside coil.
A 120-turn coil of radius 1.8cm and resistance 5.3 ohms is placed outside a long solenoid of smaller radius. If the central solenoid has 220 turns/cm, carries a current of 1.5A and has a radius of 1cm, determine the current which appears in the outer coil as a function of time if the current in the inner solenoid drops uniformly from 1.5A to 0A in 0.025s.
2. Relevant equations
Magnetic Flux = Φ = surface integral of B dot dA
M = [(Number of turns)*(Φ due to 1 on 2)]/current due to 1
emf2 = -M*(di1/dt)
3. The attempt at a solution
??? not sure how to make the current a function of time and incorporate into the solution, also I am confused as to why I only have a turns per cm for the inside solenoid and I have an exact number of turns for the outside coil.