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

1#

96.27: A long straight wire conductor is placed bel,m :hqy -ai,hyu 5o.jjow a compass. When the conventional current in the ya yq.o:u,hh 5mij-j ,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 to be cut in half along the dotted lines shownc*aqj96,6gbqdh kn aqw(tpc(7w gp1 ). None of the pieces artjd6k 6b,ppg7(*) cq1(qc9 a qhwangwe 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 rigkk amagyj34;8q j c8e3ht depicts iron filings sprinkled around three permanga38kje3 a 4qkj;8mycent magnets. 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 curreyt1 4a zuh/v8d3 cc:h1xya:r rnt flows from left to right in a wire as shown in the diagram, w8 4cdrh :ra1 uy:3za/cyth1vxhat 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 wirxeb2s+b--cq 9gk25z x+qpraj e from left to right as b52kx g9-q-px 2+j zarsbc+qe shown in the accompanying diagram. 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 physics, whfq,i*2 o hct:2l5 aevxich representation of magnetic field lines is inconsistent? The squares in tivhoql cf 5:,te x22*ahe 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 inte xpg ( uc8r2ww3yupm5(2u.fv o the plane of the page as shown in the figure. Which one of the arrows shown best indicates the direction of the ma.(m2pe3 r( u8 uyv xww2cupfg5gnetic 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( 3f (udtqzr5c conventional current in the left wire (2 A) comes od 5zutr(cf (3qut 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 current-carrying wires are shown end ofkj8a5 sm ts5*h /qzk5n in the figure below. ha 5jts 5zfqkks *85/mThe 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 cqnrnp1z uh+, 6/br-a xoil of wire. A conventional electrical current is then run through the coil fr-h1ap+qz xr r/b,u n6nom left to right as shown. 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 poiqd sw;jr7a d26nt P inside the solenoid shown 6j;2 adqdwr 7sis
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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