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

1#

96.27: A long straight wire t t rt.)twsd(upzbv6:fx phn9lo;i9 tdb3 6(1 conductor is placed below a compass. When the conventional current in 9psu6zt p; h vrdif)wx(btd3to (tntb6:9l. 1the 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 are rf8t*9cpl 5adzp) (i lto be cut in half along the dotted lines shown. None of the pieces are*zfill(59 ) d pacpt8r 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 sprt nt(*josfb0v2i:f::czm,w ninkled around three permanent magn, m2zv*nbn:ft t:c0 ws(jf:ioets. Pole R is the 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 /dhgv vk7ku3(y1s pkn7u+ qqa2v syjf44:7 kjleft to right in a wire as shown in the diagram, wha:sj vn +47hk(uk 2fyjs/ qugp7 14kvvdqka7 y3t 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 fvlgz5 *j ez8,a1q3njurom left to right as shown in the accompanying diagram. Which option beste a31zlq8 v5j*gu,jnz 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 w9e5 /p2c6mo d2 hmfkosz b+4vunderstanding of physics, which representation of magnetic field lines is inconsiste 5/mo2k2swodm+f pcv4h z9e6bnt? 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 curren7dx/y yn d;-28v im t,4+qevw7 ,ikbfcxm :ihct directed into 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 thi dt,xxv -,m:hc;+bni72vei y/ q48m ykcwd7fis 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 fiuss riu )f2ay h,r3tkxzv6,2rc*s 3 bf(ij :,bxed 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 x-axis (aside from infinity) at which the magnetic field is eqr*i()j 3 ab, srz t3u,hfbyvc6i x2s:srk2fu ,ual 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 th a+rrdrd lbr bx ** ;;tdvo(kgv2:2jv4e figure below. v*ro*r+(axrk g2rtjv4v2dl :;d bd;bThe 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.;na*4li-h8cc g h3 vda A conventional electrical current is then run through the coil from left to right as shown. This will cause thl hga3h 8a4cn; civ-*de 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 so;4 ;,d7ly ik8sux( tf wz(gmhblenoid shown ig; u(bkwis 7zd(f;,mx84 ytlhs
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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