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?作业考试练习?美国物理杯赛(Physics Bowl)?magnet and magnetic field lines

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习题练习：magnet and magnetic field lines

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作者: admin 发布日期: 2024-08-02 21:11 总分: 12分得分: _____________

答题人: 游客未登录开始时间: 24年07月29日 14:24 切换到: 整卷模式

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单选题 ( 1.0 分) 切至整卷模式搜藏此题

96.27: A long straight wenrvb .gsxxn dc0nl2rmyt 9105 b9m8-ire conductor is placed below a compass. When the conventional current in the conductor is from south to north and large, the N pole of the compa1vxmn0s0c9bg8m.n9td rly bn2e-rx5ss:

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单选题 ( 1.0 分) 切至整卷模式搜藏此题

97.17:Two bar magnets are to biem0:zmz )qf8g0eg1k e cut in half along the dotted lines shown. None ofem ef0kgq8 gz0:m1) zi the pieces are rotated. After the cut:

A. None of the halves will attract any other.

B. The two halves of each magnet will attract each other.

C. The two halves of each magnet will repel each other.

D. The two halves of the top magnet will repel, the two halves of the bottom magnet will attract.

E. The two halves of the top magnet will attract, the two halves of the bottom magnet will repel.

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单选题 ( 1.0 分) 切至整卷模式搜藏此题

98.21: The diagram to the right depicts iron filings sprink;c i:i;r+ ,sajgj56 i jemyxv 3 i-f+fswg-x7lled around three permanent m i57 xgsrj fi+x;fm as--i +jlv g6ic3ew;j:y,agnets. Pole R is the same as poles

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单选题 ( 1.0 分) 切至整卷模式搜藏此题

99.04: If conventional (positive) electric current flows foi4.q(qr.wa mq: ada; rom left to right in a wire as shown in the diagram, what is the directqi4q;.oa:a( q .awr mdion of the magnetic field at point P?

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单选题 ( 1.0 分) 切至整卷模式搜藏此题

97.02: An electric curreq nw,.1qj;do- vcj dp;j2aqx:nt flows through a horizontal wire from left to right as shown in the accompanying diagram. Which option best rv.2w1njj;-o qx dq ,c;j:padqepresents the direction of the magnetic field at point P?

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单选题 ( 1.0 分) 切至整卷模式搜藏此题

06.41: From our current understanding of physics, whi:l53ls6qon lwch representation of magnetic field lines islq:3 wlnl6o 5s inconsistent? The squares in the diagrams below simply represent regions of space.

A. B. C. D.

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单选题 ( 1.0 分) 切至整卷模式搜藏此题

12.28: A long straight wiu-t0c9m3m,2ieox thy re has a conventional current directed into the plane of the page as shown in the figure. Which one of the arrows shown best indicates the direction of the magumi, h2mct 3 ty9e0x-onetic field associated with this wire at the location labeled P?

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单选题 ( 1.0 分) 切至整卷模式搜藏此题

17.33: Two long wires are fixed in space s07dpg2uz4xyc d 7hpd9uyq o*7o ;ext)o that the conventional current in the left wire (2 A) comes out of the plane of the page and the conventional current in the right wire (3 A) goes into the plane of the page. In which Region(s) is there a place on the x-axis (asidxht 4*2d9gu edu q777 )ydpocxz0o;pye from infinity) at which the magnetic field is equal to zero from these currents?

A. Only in Region I

B. In both Regions I and II

C. Only in Region II

D. In both Regions I and III

E. In both Regions II and IIID. electric field strength divided by magnetic field strength

F. charge divided by mass

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单选题 ( 1.0 分) 切至整卷模式搜藏此题

04.31: Two very long current-carrying wires are shown endtpu5tsm0hz 49 on in the figure below. The wire mtp9 h st450zuon
the left has a 4A current going into of the plane of the paper and the wire on the right has a 3A
current coming out of the paper. Disregarding the case of x → ±∞, in which region(s) could the
magnetic field from these two wires add to zero on the x-axis.

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10#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

02.31: A compass is placed near a coc1 pt 2k:g6 pikm1+p eub ggv0f4(gd0nil of wire. A conventional electrical current is then run through the coil from left to right as shown. This will cause the 12i:+4pmckv0ggkg16(d bpputfne0g North pole of the compass to:

A. point toward the left

B. point toward the right

C. point toward the bottom of the paper

D. not move since the magnetic field of the coil is into the paper

E. not move since the magnetic field of the coil is out of the paper

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11#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

05.19: The magnetic field line passing through point P inside the solpqqiv)0jr r 8 5vuh;2benoid shown jpq;0h5ivb2 u 8r)qrvis
directed

A. to the right.

B. to the left.

C. downward the bottom of the page.

D. upward toward the top of the page.

E. in no direction since the magnetic field is zero.

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12#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

05.36:When one compute the square root of the ratio of the permeability of free space to the
permittivity of free space, one obtains $\sqrt{\frac{\mu_0}{\varepsilon_0}}$= 377. What is the unit of this quantity?

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总分:12分及格:7.2分时间:不限时

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