What is the direction of the induced current in R when the current I in the figu

Question

What is the direction of the induced current in R when the current I in the figure decrease rapidly to zero? a) Undeterminable from the information given b) From b to a through R c) From a to b through R 7. A hollow cylinder of inner radius a = 5 cm and outer radius b = 7 cm. A uniform current density j = 1 A/cm^2 flows through the cylinder. Calculate the magnitude of magnetic field at a distance d = 10 cm from the axis of the cylinder. A) 0 B) 1.5 times 10^-4 T C) 2.5 times 10^-4 T D) 4.5 times 10^-4 T E) 0.5 times 10^-5 T 8. A cooper bar is moved to the right while its axis is maintained perpendicular to a magnetic field, as in the figure. If the top of the bar becomes positive relative to the bottom, what is the direction of the magnetic field? a) Directed into the paper b) Directed out of the paper c) Undeterminable from the information given

Explanation / Answer

1) Correct answer is;

(c) From a to b through R.

Because:

Since the current in moving in the wire to the right, the magnetic flux through the loop will be directed out of the page. If this current keep decreasing in time, the change in flux will be directed into the page. The induced current has to flow anticlockwise around the loop producing a flux directed out of page and apposing the change of flux due to the decrease in current in the wire.

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