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1#

99.29: Two light wires are hung vertically. With electrical current in bot.t wzj:1b()bk6 nwd. 0la rwzml w4w)kh wires direbnbzl)dwt 4k.)6 ww( :.arlmjw 10kzwcted 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 4ssbne4v f,f.-e cn5caccompanying 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 t4,b-5scsfef nnv4 ec .he 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{μ_{0} I}{2 π a}

toward the upper left hand corner.

B.

\frac{μ_{0} I}{2 π a}

toward the lower left hand corner.

C.

\frac{μ_{0} I}{π a}

toward the upper left hand corner.

D.

\frac{μ_{0} I}{π 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 8eidc +4k;vlri w +jz or-;1vdcurrents in the same direction as shown in the diagram. How does the magnitude of the force on A from B compare to the f;r; o kvc+jv rl+ i1d84ze-widorce 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-carryinm2y29v oxm xvr6 sjc. .dj(7png 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 thmsc.vpoy 2m976j nj2.d( xrvxe 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 ub8n 3eb1mlk1(ygz z1k4vha+hniform magnetic field. An arrow i1l3 hagyv1 (be8nzkkz+m4 1hbndicates the magnetic force F on the wire. Of the following possibilities, the direction of the magnetic field must be

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