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frostchaos123
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Homework Statement
A toroidal solenoid has inner radius r1=15.0 cm and outer radius r2=18.0 cm. the solenoid has 250 turns and carries a current of 8.50 A. what is the magnitude of the magnetic field at the following distances from the center of the torus (a) 12.0 cm; (b) 16.0 cm; (c) 20.0 cm?
Homework Equations
Using Ampere's Law, B(2*pi*r) = [tex]\mu[/tex]NI
The Attempt at a Solution
The answer given is that if r < r1, the B is 0 as the I enclosed is 0.
However what i do not understand is that why is when r > r2, the I enclosed is also 0?
If r > r2, shouldn't the circle formed encompass the entire solenoid and thus all of the current?
Thanks.