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# A very long, tightly wound solenoid has a circular cross section of radius 2 cm (only a portion of the very long solenoid is shown in the gure below)....

A very long, tightly wound solenoid has a circular cross section of radius 2 cm (only a portion of the very long solenoid is shown in the ﬁgure below). The magnetic ﬁeld outside the solenoid is negligible. Throughout the inside of the solenoid, the magnetic ﬁeld B is uniform, to the left as shown, but varying with time t:B=(0.07+0.03t^2) tesla. Surrounding the circular solenoid is a loop of 7 turns of wire in the shape of a rectangle 11 cm by 18 cm. The total resistance of the 7-turn loop is 0.1 Ω

At t = 2 s, what is the magnitude of the current in the 7-turn loop?

A very long, tightly wound solenoid has a circular cross section of radius 2 cm
(only a portion of the very long solenoid is shown in the ﬁgure below). The
magnetic ﬁeld outside the solenoid is...

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