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

1#

96.27: A long straight wire conductor is placed below a compass. When thwu6eq(lw d2+gjo i;l0e conventional current in the conductor is from south to north and large, the N pole of the com0ul2i(olw g; dq6w+ejpass:

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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 dm*3-gy eyw jz lpe,)-motted lines shown. None of the pieces are rotated. After the)l yz,g-peeyj-3*w mm 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 sprinqy:ar8 so d36o vos*foe p-3;lkled around three permanent magnets. Pole R is the sa 3spoq 8ov-lra3do:e6* s;y fome 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 (positivcd3kb :.aa:u jt hn w9(xqi5 rlb+8uc:e) electric current flows from left to right in a rbx(u :atl3qu8.i ac+h c 9wdbk:j5:nwire as shown in the diagram, 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 abb*oe91de 5tfq 2,odm horizontal wire from left to right as shown in the accompanying diagram. Which option best represents the direction of the magnetic fieed *9e,o1b5 m q2dtobfld 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 physp p72)dk,9 js8posl2r zadeg7ics, which representation of magnetic field lines is inconsiste aj9z7 pslserg22dok8p) 7dp ,nt? 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 current directed into the plasy4gj s)/o ho*ne of the page 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 o )/oh *j4gsyslabeled 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:av76agg9- m n:gidrm in the left wire (2 A) comes out of the plane of the page and the conventional-rgiaamgv m:76:nd 9g 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 ony un)ymairfq9toyzf.25v9 , 5g1z w/i in the figure below. T9y1gy,)yqt9zizo5airn /2f v5w f.m uhe 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 neqx6bv vl0e44 ,grvo8ear a coil of wire. A conventional electrical current is then run throq bvrx v4e oev0g68l4,ugh 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 passing through /8jj-flg yb0 w4lndn8point P inside the solenoid shown is 0wj-gfj/dn l8yl8n4b
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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