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1#

99.29: Two light wires are hung vertically. With electrical coqo( l)t :qq0xyk .ix5urrent in both wires d o5:lo.t(x)x0kqi qqy irected 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 l sgb*x+pfson 39/c, izong wires are arranged as shown in the accompanying figure’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 pa/b scz x+gif39 *nps,oge. 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 field 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 curre . 5 :ptvvo)hk7iprck:nts in the same direction as shown in the diagram. How does the magnitude of the force on A from B compare to the force on B irvp:5)k7 hpvk :cot.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 ide71zb)(tc (rpx +ti zxak 4nk7dntical current-carrying wires shown (with conventional current coming out of the plane of the page), the wire on the right is labeled P. What is the direction of the magnetic force on the wi+tx 1kiczkd t)(4azrnp(7 x7bre 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 cu 6gz*ctcv+uwx k-k9g( rrent i in a uniform magnetic field. An arrow indicatecw zv-kcx *u6+gg t(9ks the magnetic force F on the wire. Of the following possibilities, the direction of the magnetic field must be

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