magnet and magnetic field lines - 题库网 (tiku.one)

1#

96.27: A long straight wire conductor is placed below a compass. Whekvp-q0j6mutf dm ; 8u5n the conventional curref0t m 6d8-m ujpuqk;v5nt in the conductor is from south to north and large, the N pole of the compass:

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2#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

97.17:Two bar magnets a:/r 5(ebdqo yvre to be cut in half along the dotted lines shown. None of the pieces are 5v(:b/deoy q rrotated. 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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3#

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 sprinkled around three pmtatf *xk7nv;k1a * z( 2zs9 dhlq90qpermanent magnets. Pole R is thexq h9(7vqzkp tda9a1n ms*f k0z;tl2* same as poles

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4#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

99.04: If conventional (positive) electric current flows from left tihs kn6c 9;9djo right in a wire as shown in isdn 6c9;9h kjthe diagram, what is the direction of the magnetic field at point P?

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5#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

97.02: An electric current flows through a horizontal wire from left sh,*k*hue,1 ie n k0n9vqi:qvto right as shown in the accompanying diagram. Which option best represents the direction of the magnetic field 1e*un09nev k:q ih,k *vhsi,qat point P?

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6#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

06.41: From our current understanding of physics, which reprevni)c)9 w*nuq+d jqt phtf85 x3l2g1asentation of magnetic field linesn lj itnpv *c wd)tq 38qg)15f2xh+ua9 is inconsistent? The squares in the diagrams below simply represent regions of space.

A. B. C. D.

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7#

单选题 ( 1.0 分) 切至整卷模式搜藏此题

12.28: A long straight wire has a conventional current directed jk-7f qv ew0g**xl/bfinto the plane of the page as shown in the figure. Which one of the arrows shown best indicates the direction of the magnetic field associated withwx bf/ j0*7lg-efq*kv this wire at the location labeled P?

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8#

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 so that the conventional curre(pf 6o (zybt 9;jekmq ,0g1mgznt 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 (aside from infinity) atzgp ojy;g1(e(60 mm9f tq zb,k 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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9#

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 end on in the figure belb erk,:(cz) h9jsaft r9yd+ 8 749imlj:sx ykvow.irr thy j,csbk4vsd9zej9lyf:x(a+ :7 k)8m 9 The wire on
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 coyf;r:h2 n11 rqx y:n9 -nlv1(kyspzi yil of wire. A conventional electrical current is then run through the coil from left to right as showz f1(qnisn x r9hlr1:pkyy n21 -:yv;yn. This will cause the 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 solenoid y ni(+p-+j+xaemizxo1 g l7(k shown is - + 1ji7eakynz(xi( m+x gl+op
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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