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

1#

96.27: A long straight wire conductor is placed below aahx2; 5 j(i( oaepi;cx4su)mx compass. When the conventional current in the conducto ix;(5ahc i a)x(sejm; x42puor 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 aremyi47e4x29/ lbj ja h (iemc87d+f bml to be cut in half along the dotted lines shown. None of the pieces are rotated. After the cut:h7 eme4mlml9(i2 bbyjji7/xc4d +8f a

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 t b-rodp* ;zp bmz42:lqhree permanent magnets. Pole R is the same as polesql4;- 2p :b*pd mbrozz

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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 currx-t ;ujw6 m)vsent flows from left to right in a wire as shown in the diagram, what is the direction of t -6vj;xmus)w 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 le*gw iu,rdq1fg h6(u7eft to right as shown in the accompanying diagram. i7wf e1udg,(6*h gruq Which option best represents the direction of the magnetic field at 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 physicm 3pg njv g11j x0a7g37xaq0fts, which representation of magnetic field lines is inconsistent? The squares in the diagrams belonvg7qaptxg0g7am1 jf3j 1x3 0w 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 intv0 a0;wby :ej6(btyw:zmms6jo 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 with this wire at the location lays0m(:em : y ;w vwbjba6zt6j0beled 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 qus3j)jp. l*s l6ypb(so 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 l6*bls(3. jpujs qy) px-axis (aside 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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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 an/vz9 zv(y;s ppkyo6;re shown end on in the figure below. The wire oznz(vy kp/o 6p v9;s;yn
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 coil of w . t-grvyg5diexk/r2/ire. A conventional electrical current is then run through the coil from left to right as shown. vr.d rk/tge /i-xg2y5 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 sa3yso pkn 61yy xt6(57y79iewa m ;wtjhown isk 6yox jas ww ympn7659yi1aett (3y7;
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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