For the situation described in the figure,r 2 =2R=5.0cm, and the magnetic field

Question

For the situation described in the figure,r2=2R=5.0cm, and the magnetic field changes with timeaccording to B=(2.0t3-4.0t2+0.80)T, where tis in seconds. What is the direction of the force on an electron atr2=0.1m at t=1s?

A)radial, inward
B)radial, outword
C)tangential, clockwise
D)tangential, counterclockwise
E)undefined Hint: At t =1s the field is pointing into the page and its magnitudeis decreasing. dB/dt therefore points out ofthe page. The induced emf tries to prevent this change byproducing a current flowing clockwise, so that the field producedby that current is pointing into the page. But if the currentflows clockwise, the electron moves tangential, counterclockwise,since the direction of current flow is the direction positivecharges would move.

A)radial, inward
B)radial, outword
C)tangential, clockwise
D)tangential, counterclockwise
E)undefined Hint: At t =1s the field is pointing into the page and its magnitudeis decreasing. dB/dt therefore points out ofthe page. The induced emf tries to prevent this change byproducing a current flowing clockwise, so that the field producedby that current is pointing into the page. But if the currentflows clockwise, the electron moves tangential, counterclockwise,since the direction of current flow is the direction positivecharges would move.
Hint: At t =1s the field is pointing into the page and its magnitudeis decreasing. dB/dt therefore points out ofthe page. The induced emf tries to prevent this change byproducing a current flowing clockwise, so that the field producedby that current is pointing into the page. But if the currentflows clockwise, the electron moves tangential, counterclockwise,since the direction of current flow is the direction positivecharges would move.

Explanation / Answer

They give you the explanation and the answer in thehint: . But if the current flows clockwise, the electron moves tangential,counterclockwise, since the direction of current flow is thedirection positive charges would move. . So the answer isD

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