PHYSICS 104 Midterm: PHYS 104 UW Madison Exam 2s03

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31 Jan 2019

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Two electrons are located in a region of space where the magnetic field is zero. Electron a is at rest; and electron b is moving westward with a constant velocity. A non-zero magnetic field directed eastward is then applied to the region. In what direction, if any, will each electron be moving after the field is applied? electron a electron b. A loop of wire with a weight of 1. 47n is oriented vertically and carries a current i = A segment of the wire passes through a magnetic field directed into the plane of the page as shown. The net force on the wire is measured using a balance and found to be zero. A solenoid of length 0. 25 m and radius 0. 02 m is comprised of 120 turns of wire. Determine the magnitude of the magnetic field at the center of the solenoid when it carries a current of 15 a.

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clockwise counterclockwise clockwise in twoofthe loop sides and counterclockwise in the other two zero dependsupon whether or not B is decreasing at aconstantrate

As an externally generated magnetic field through a certainconductingloop increases in magnitude, the field produced at pointsinside theloop by the current induced in the loop must be:

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A long straight wire is in the plane of a rectangular conductingloop.The straight wire carries a constant current i, asshown. Whilethe wire is being moved toward the rectangle thecurrent in therectangle is:

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In the experiment shown:

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The plane of a square loop of wire with edge length a = 0.200 m is oriented vertically and along an east–west axis. The Earth’s magnetic field at this point is of magnitude B = 35.0 μT and is directed northward at 35.0° below the horizontal. The total resistance of the loop and the wires connecting it to a sensitive ammeter is 0.500 Ω. If the loop is suddenly collapsed by horizontal forces as shown in Figure P30.37, what total charge enters one terminal of the ammeter?

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A rectangular loop of wire has dimensions of 0.500 m by 0.300 m. The loop is pivoted at the x-axis and lies in the XY plane as shown in Figure P28.34. A uniform magnetic field of magnitude 1.50 T is directed at an angle of 40.0° with respect to the y axis with field lines parallel to the yz plane. The loop carries a current of 0.900 A in the direction shown. (Ignore gravitation.) We wish to evaluate the torque on the current loop.

(a) What is the direction of the magnetic force exerted on wire segment ab?

(b) What is the direction of the torque associated with this force about an axis through the origin?

(d) What is the direction of the torque associated with this force about an axis through the origin?

(e) Can the forces examined in parts (a) and (c) combine to cause the Loop to rotate around the x-axis?

(f) Can they affect the motion of the loop in any way? Explain.

(g) What is the direction of the magnetic force exerted on segment bc?

(h) What is the direction of the torque associated with this force about an axis through the origin?

(i) What is the torque on segment ad about an axis through magnetic force exerted on segment bc? (h) What is the direction of the torque associated with this force about an axis through the origin? (i) What is the torque on segment ad about an axis through the origin? O) From the point of view of Figure P28.34, once the loop is released from rest at the position shown, will it rotate clockwise or counterclockwise around the x-axis? (k) Compute the magnitude of the magnetic moment of the loop. (1) What is the angle between the magnetic moment vector and the magnetic field? (m) Compute the torque on the loop using the results to parts (k) and (1).

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PHYSICS 104 Midterm: PHYS 104 UW Madison Exam 2s03

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