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# M3 - Phy sics 7B WS M3(rev 2.0 Page 1 M-3 Magnetic Fields...

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Physics 7B WS M3 (rev. 2.0) Page 1 M-3. Magnetic Fields Questions for discussion 1 . Sketch the magnetic fields created by these currents: a) A long straight wire. b) A circular current loop. 2 . Suppose we have two long, straight current-carrying wires running parallel to one another. If the two currents flow in the same direction, will the wires attract each other or repel each other? 3 . A long straight wire has a net charge per unit length λ . a) If the wire is fixed in place, what is the strength of its electric field?

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Physics 7B WS M3 (rev. 2.0) Page 2 b) If the wire moves along its length with speed v, what is the strength of its magnetic field? Does the wire still have an electric field when it moves this way? 4 . A straight conductor carrying a current i is split into identical semicircular turns as shown. What is the magnetic field strength at the center? Carefully explain your reasoning.
Physics 7B WS M3 (rev. 2.0) Page 3 Problems 1 . A long wire is bent into the hairpin-like shape shown in the figure. a) What is the direction of the magnetic field at the indicated point P, which lies at the center of the half-circle? b) What is the magnitude of the magnetic field at that point? (Hint: At the center of a circular current loop of radius R, the loop’s magnetic field has magnitude B loop, at center = μ 0 i / 2R.) c) Suppose an electron is at rest at point P.

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M3 - Phy sics 7B WS M3(rev 2.0 Page 1 M-3 Magnetic Fields...

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