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1#

99.29: Two light wires are hung vertically. With el;r9xtf e21mp1cm9vl, c( szsf ectrical current in both wires directed upwards;scs 9fmm2 (rx z9 l1ft1evc,p

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 infinite0:885 e umms- yl ph*hrrah4qjly long 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 page. The other conventional currents are out of the plane of the page. Point P is a distance a rq 8hhr yas5* j-e0h:m4mp lu8from 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 ag7c-a3y(,a(y z.kb2zib pn nyre carrying different electric currents in the same direction as shown iybz(cza , g-3(yypbk. ni7na2 n the diagram. How does the magnitude of the force 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-carrying wirex0x6q g.pizs)iwp5kr 8n)ih 8s 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 wire labeled P from the other wires8) iprz0p86i kq.gni)5xhxsw?

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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 wir q5vn9 7l1.nqibpuat 5e carrying current i in a uniform magnetic field. An arrow indicates the mnna .iqu571 5q9lb vtpagnetic force F on the wire. Of the following possibilities, the direction of the magnetic field must be

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