PHYS 102 Lecture Notes - Lecture 22: Angular Frequency, Magnetic Flux, Provatas

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1 May 2016

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Question 7: the area of a circular loop is changing in a uniform magnetic field as shown in the figure. What is the direction of the induced magnetic flux and the induced current in the loop? o: flux will go into the page (compensate for the loss of flux) and induced current in clockwise direction (compensation) Question 8: a conducting loop moves into an uniform magnetic field as shown. What is the direction of induced flux and induced current? o: flux will go out of the page and the induced current in ccw direction, this is because the flux is increasing as the loop enters the field. Question 9: figure below shows a circular conducting loop falling toward a wire carrying a current to the left. What is the direction of the induced current in the loop of wire? o: ccw, flux increases into loop as ring fails; drop the string, spike in voltage as it falls.

Related Questions

A loop of wire is lying flat on a tabletop. A uniform magneticfield is directed vertically UPWARDS such that it is perpendicularto the tabletop (and the loop) and pointing toward the ceiling.Beyond the edges of the table, the magnetic field is zero. Imaginethat you are looking DOWN on the loop from above. Which of thefollowing statements are true about the induced EMF in the wireloop?

1)If the magnetic field suddenly decreases, the induced currentwill be in a counter-clockwise direction.
2)If the magnetic field suddenly decreases, the induced currentwill be in a clockwise direction.
3)If the loop suddenly shrinks in size, the induced current will bein a clockwise direction.
4)If you pull the loop out of the field, by sliding it off thetable, the induced current will be in a clockwise direction.
5)Lenz's Law states that the induced current always leads to amagnetic field that OPPOSES the change in magnetic flux.
6)If you keep the loop on the table, but pull it to the right,there will be no induced current.

Figure CQ20.3 shows three views of a circular loop in a magnetic field. In each view, the illustrated change results in an induced current. Indicate the direction of this induced current as either CW (for clockwise) or CCW (for counter-clockwise) if: (a) the loop (viewed edge-on) is rotated away from perpendicular to the magnetic field, (b) the loop area increases, and (c) the magnetic field weakens.

Figure CQ20.3

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A long straight wire carrying a steady current is in the plane of a circular loop of wire.

(a) If the loop is moved closer to the wire, what direction does the induced current in the loop flow?

(b) At one instant, the induced emf in the loop is . What is the rate of change of the magnetic flux through the loop at that instant in webers per second?