magnet and magnetic field lines - 无忧得胜-网上国际课程 (5edu.win)

1#

96.27: A long straight wire conductor is placed below a compaso0o diwap (p /*tsu)eg*i-,d bs. When the conventional current in the conductor is from south to north and -*,(ab*0do esuptioi)gdpw / 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 to be cut in hfur*-( i/ykt wie+sz 9giu(;ealf along the dotted lines shown. None of t- ef/ut+*iz9r(;e i s(iwgkyu he 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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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 fionwhe.+3s9yey , kki/ lings sprinkled around three permanent magnets. Pole R iokyn+/ke3s ,yh.w e9is 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 ng q dr;r7 z589 eqq*:artaga6from left to right in a wire as shown in the diagram, what is the direction e8d aa9qgrqz7 ta:5qg*r;r6n 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 hg 5di hvmf4a:esxp)n;)1iy/norizontal wire from left to right as shown in the accompanying diagram. Which option best represents the direction of the magnets;dha yx g41f5: ve)imn ip/)nic 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 understandi,hm0uz yp kbrh88 fe5-ng of physics, which representation of magnetic field lines is inconsistent? The squares in the diagrams below simply repe-z 08rhk,8f myuhbp 5resent 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 wik ;0kh8 vsre7hmezq u,uwwtq)5(up3 *re has a conventional current directed into the plane of the page as shown in the figure. Which one of the arrows show0,t (e758wru3sekqqp u w*zum)hhv ;kn best indicates the direction of the magnetic field associated with 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 current in kdg2j-jynv0;p)ykbq* por.i 76be g( the left wire (2 Av)y 62ey*qg jnor;gbbki.dk0 (7pjp-) 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 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 curti gb5q6u z e4hty4x10rent-carrying wires are shown end on in the figure below. zgbh46 45 ietuqx0t1y 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 coil of wire. A conventional electrical currem6r d:6yroiz1bvun70 nh kl/ +3+nevant is then run through the coil from left to right as shown. This will cause the North pole of the ea61 i+vvrnno/k6 budlhz: 73rm+0yncompass 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 si.x q2jwln 8.9 qr0 xr:ky*cziolenoid shown0qqxx ic8 r.wkz:l .*nyi2r9j is
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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