A long vertical wire carries a steady 70 A current. As shown in ...

[Brittanyd9008]

Question 1

A round flat metal coil has 180 turns and negligible resistance. It is connected in a series circuit with a resistor, with nothing else in the circuit. You measure that a current flows through the resistor when a magnetic field through the coil, perpendicular to its area, is changing at What is the radius of the coil?
◦ 0.54 m
◦ 0.25 m
◦ 0.014 m
◦ 0.043 m

Question 2

A long vertical wire carries a steady 70 A current. As shown in the figure, a pair of horizontal rails are 0.20 m apart. A 20-Ω resistor connects points a and b, at the end of the rails. A bar is in contact with the rails, and is moved by an external force with a constant horizontal velocity of 0.90 m/s to the right, as shown. The bar and the rails have negligible resistance. At the instant that the bar is 0.20 m from the wire, what are the induced current in the resistor and its direction through the resistor? (μ0 = 4π × 10-7 T ∙ m/A)



◦ 0.63 μA, from a to b
◦ 0.32 μA, from a to b
◦ 0.32 μA, from b to a
◦ 0.63 μA, from b to a
◦ 1.9 μA, from b to a

[wshriver]

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[Brittanyd9008]

Excellent

[wshriver]

Great! Please up vote