APFIVE Induced EMF in a Toroidal Solenoid
A toroidal solenoid has 800 turns, mean radius 15 cm, and cross-sectional radius 2.0 cm. The current follows $$I(t) = (3.0 \, \text{A})(1-e^{-t/\tau})$$ where $$\tau = 0.10\,\text{s}$$. What is the magnitude of the induced emf in the solenoid at $$t = 0.10\,\text{s}$$?
A
2.2 × 10^-3 V
B
5.5 × 10^-4 V
C
3.3 × 10^-3 V
D
1.1 × 10^-3 V
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