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

1#

96.27: A long straight wire conductor isyw--hhhoiifi( kr365 0xo( ul placed below a compass. When the conventional current in the conductor is from south to north and large, the N pole of the compao u(l h3rhhio-0kixwyi f 5(6-ss:

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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 half1jcjn;w/ kwt7 along the dotted lines shown. None of the pieces are row/;kjjc 7tn1 wtated. 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 arlr /dw5,pr gai gf26l:;kt0e vound three permanent magnets. Pole R it5:a26 lvifl;ggr w0d/ k pe,rs 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 (positi/q**rlm-eojwrx4qv3a sn1 (jve) electric current flows from left to right in a wire as shown in the diagram, what is*r-enq jov4(swjmlqx* 13r a/ 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 flowstw3 xur1*r+ zs through a horizontal wire from left to right as shown in the accompanying diagram. Which option best represents the direction of the magne13st* +rwuzrx tic 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 representation of ,rr9d ,xxhot :j6m o5jmagnetic field lines is inconsistent? The squ,x j9rhx 6doo,:5t mjrares 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 colf 4v2zy+w,h4cd4gm 0ydlr/ r nventional current directed into the plane of the page dc 2,y0d/fm hlyr 44+4zlvrwg 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 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 wireswz ((yh5r;hj ujpow7)ups v0t; - cmp1 are fixed in space so that the conventional current in the left wire (2 A) comes out of the plane of the page and the conventional curren ju;;0mowv(wr7 )5szyhj1 cup- (ppt ht 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 cu1 jf k/0 t.4/mcwltopirrent-carrying wires are shown end on in the figure below. The wir4m/kpt w/l1j.it0 fo ce 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 convew4*lt p y15wy)qvo 0ywntional electrical current is then ry14pvy q0)y5o wwtw *lun through the coil from 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 paj ypd wrh;vy1(w71am; ssing through point P inside the solenoid shown y;yaw11(rjmh7 ; wvpdis
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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