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1#

99.29: Two light wires are hung vertica ,76ygg ccx-l8qy+x wally. With electrical current in both wires directed up8lx,c yq+wxgy-a 7cg6wards

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 infinite0gx2y5m ,x5w cf vja6dgq(hs6 ly 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 andycg0(d,axm5 2wsf x65vqg j6h 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 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 wire.ruos2t . liokvjq9k u6q 10j(lnq.j9 s are carrying different electric currents in the same direction as shown in the d ujq(6 qqknjlu ik2.t0 9olj.1o9r.sviagram. 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 wires shown (with conventionalikxul:a*)3 h9i p6tpf nn1af0 current coming out of thepnah91aifkx:f ti pl *)3 un60 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 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 belowt+ghuf )sjt 2(u 22p*q puj3ng shows a straight wire carrying current i in a uniform magnetic field. An arrow indicates the magnetic force F on the wire. Of the following possibilities,2 p*) jtnuh+3g22tgqsp uju( f the direction of the magnetic field must be

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