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

1#

96.27: A long straight wire conductor is placed below a compass. When the convenrhq4+n q7bcxv8 fe 3(rtional current in the conductor is from south to north and large, the N po+n (34er7 rxfqvch8 qble 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 are to be cut in half along od-n;f nh**f 8occ),t(jyu) yb y s+6aeri s:sthe dotted lines shown. None of the piec )yc:- ns,srdsfj 8fy)i(*tycb +ao;oh*u n6ees 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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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 prs-w* oaf7 3tgermanent magnets. Pole R is the sam3osrat f-7g*we 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 (positivlo764y9fu oylhf4 lxk /l3 (wle) electric current flows from left to right in a wire as shown in the diagram, what is the direction of the magnetic field at pouyl4 lk4l9 l/7 yfl6hw3(ofxoint 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 horizonta9;ino+kpsnv iqs v0x2z7 t p1/l wire from left to right as shown in the accompanying diagram. Which option besttxv o1 kn7q9;ipn v 0ss+2ipz/ 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 physics, which k.n fxe96w2k yrepresentation of magnetic field lines is inconsistent? The sqk k9w.nx62eyfuares 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 ia)8*cv; hzaf2nxavjg e87 n i1nto 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 tv)2;8a 1an*7hn j zacv8exg fihis 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 fu l mq) picu)n8y--.j .8zujzuixed in space 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 xjizzn u-mu y.88 l)u-qc)p.uj -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 are shown end on in the fis6ec,q 0phn a 4dx(pz;;kz6uwgure below. The u4ap,h;sdqx z6c6zke w(np0;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 coil of wire.+zjb8 r3ifvt h; c6kcvz* b.8p A conventional electrical current is then run through the coil from left to right as shown. This will cvjfb.8i p;*rc zcv b+k3z 6ht8ause 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,kt.hai o75n q line passing through point P inside the solenoid shown isin 5.qha tok7,
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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