Chapter 29: Q. 3 (page 796)
The wire is broken on the right side of the circuit in FIGURE Q28.3. What is the potential difference between points ? Explain.

Short Answer
The potential difference between the two points is given by
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Chapter 29: Q. 3 (page 796)
The wire is broken on the right side of the circuit in FIGURE Q28.3. What is the potential difference between points ? Explain.

The potential difference between the two points is given by
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A conducting bar of length l and mass m rests at the left end of the two frictionless rails of length d in FIGURE P29.75. A uniform magnetic field of strength B points upward.
a. In which direction, into or out of the page, will a current through the conducting bar cause the bar to experience a force
to the right?
b. Find an expression for the bar’s speed as it leaves the rails at
the right end.
Find an expression for the magnetic field strength at the center of the circular arc in FIGURE P29.45.

An electron moves in the magnetic field with a speed of in the directions shown in FIGURE EX29.27. For each, what is magnetic force on the electron? Give your answers in component form.


a. An infinitely long sheet of charge of width L lies in the x y plane between x=-L / 2 and x=L / 2. The surface charge density is Derive an expression for the electric field along the x-axis for points outside the sheet
b. Verify that your expression has the expected behavior if.
Hint:
c. Draw a graph of field strength E versus x for x>L / 2.
The 10-turn loop of wire shown in FIGURE P29.71 lies in a horizontal plane, parallel to a uniform horizontal magnetic field, and carries a 2.0 A current. The loop is free to rotate about a nonmagnetic axle through the center. A 50 g mass hangs from one edge of the loop. What magnetic field strength will prevent the loop from rotating about the axle?
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