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1#

99.29: Two light wires are hung vertically. With electrical current in both .b:bdf/eh x 4bwiresfhxb/:4 ed b.b directed upwards

A. the wires will experience a force of attraction

B. the wires will experience a force of repulsion

C. the force on the right hand wire will cancel the force on the left hand wire

D. both wires will experience a torque until they are at right angles to one another

E. none of the above

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

94.29: Four infinitely long wires are arranged as shown in the accompanying figuah 1c c6eu;3 bnyv/)ycre’s end-on view. All four wires are perpendicular to the plane of the page and have the same magnitude of current I. The conventional current in the wire in the upper right-hand corner is directed into the plane of the page. The other conventional currents are out of the plane of the page. Point P is a distance a from all four wires. What is the total magnetic field6; 1uy /evc )nhyca3cb at point P?

A. $\frac{\mu_0I}{2\pi\:a}$ toward the upper left hand corner.

B. $\frac{\mu_0I}{2\pi\:a}$ toward the lower left hand corner.

C. $\frac{\mu_0I}{\pi\:a}$ toward the upper left hand corner.

D. $\frac{\mu_0I}{\pi\:a}$ toward the lower left hand corner.

E. 0

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3#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

03.30: Two parallel wires are carrying different electric currents -,:n thzp/mk9(t5fekvv. yrig(n9qs in the same direction as shown in the diagram. How does the magnitude of the for9 tgk:qsifpzy e.v ht/nkmn( ,5 v(9r-ce on A from B compare to the force on B from A?

A. $F_{B\

n\:A}$ =4 $F_{A\

n\:B}$

B. $F_{B\

n\:A}$ = $\frac{1}{4}$ $F_{A\

n\:B}$

C. $F_{B\

n\:A}$ = 2 $F_{A\

n\:B}$

D. $F_{B\

n\:A}$ = $\frac{1}{2}$ $F_{A\

n\:B}$

E. $F_{B\

n\:A}$ = $F_{A\

n\:B}$

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

06.37: For the four identical current-carr. *5todwvgm v akw193rying wires shown (with conventional current coming out of the plane of the page), the wire kwr v53t1.g mdo*wa9 von the right is labeled P. What is the direction of the magnetic force on the wire labeled P from the other wires?

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

05.22: The diagram below shows a straight wire carrying current i in a uniform mybf3rh/ au, v qvlyt(0)u5b8v agnetic field. An arrow indicates the magnetic force F on the wire. Of the followinvaqr/ 5y3yt8 )0hlvf b (,uuvbg possibilities, the direction of the magnetic field must be

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