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

1#

96.27: A long straight d*o7,two aqn:k8*hv k wire conductor is placed below a compass. When the conventional current in 7 :qao n8*w *odkktv,hthe 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 r,d7 f63 a57ufczwmn sbe cut in half along the dotted lines shown. None of the pieces are rotated. After then57u m w c3,zdaf6rsf7 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 filinpj1 2r: b6v7yqh mq/gqgs sprinkled around three permanent magmq6y vg1q rq:hjb2p/ 7nets. 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 cugakv87ub sn kc;: 8jw3rrent flows from left to right in a wire as shown in the a:uw; 83 cj vg8k7kbsndiagram, what 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 from lef4ih 2d fu9t8mct to right as shown in the accompanying diagram. Which option4iuhd89t cmf2 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, w j okninizfpfxk;iu7/v2 /li*:/)n3+ay v3gghich representation of magnetic field lines is inconsistent? The squares in the diagrams below simply represent r/ v7 i2/nfonugk ) ;3gii:n 3zfi+j l*y/xkvapegions 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 imu v w7gmti72x c*v;*xep hnb1 .ph+,fnto the plane of the page as shown in the figure. Which one of the arrows shown best indicates the direction of the magnet mvbi+h* nxwhc7 ;1.pg, fm7*e2x uvptic 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 wireejx5 jfh 7g6m:7cdvx0 s 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 current in the right wire (3 A) goes into the plm:6xef 0 d7j 75vhcxjgane 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 show(f af7lwhacp*zf/c vx9(/ q ;xn end on in the figure below. The wire(f 9(/lxaf fvczwa;/7c qxph* 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 electricalq -lc -xgf9yj2 current is then run through the coil from left to right as shown. This wil9yqj2- -f lxcgl 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 point 9y1w 1tf+tytz6(x y.gjlu;tw P inside the solenoid shown is 1; ty9f1lyytt x6wzw+utg ( .j
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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