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

1#

96.27: A long straight wire conductor is placed below a compass. When th j5g:x* zfbvx(y s++lve conventional current in the conductor is from south to north and large, the N pole of the compass: l5x*xfjvzg(ybv + +:s

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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 lda 9 0*er s5)qsov*xgtines shown. None of the pieces are rotated. After the cut: 0*st*r)a g9 ov5xqdes

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 around thkdzl+)l+nxhz :u tlzzps:bf43k e6..ree permanent magnet)pz 46u.el k+:zbszl h:f+d znxk3. tls. 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 conventiona o)/dsyu.weq(ql 6;c ml (positive) electric current flows from left to right in a weys6olq ;q( dmc)/ .wuire 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 a horizontal wire from left to eyfi0 fpq67:5tt4 v yyright as shown in the accompanying diagram. Which option best represents the direction of 457ptef :6 fvyy0yqtithe 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, whia,z0c uow:k) vch representation of magnetic field lines is i: vz)kaucw, 0onconsistent? 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 plycki.he3a598) y6t xxt;n uwxane 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 a wek.cny;ihtx 5u ay8 xt3)x96t 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 cu*+gw4 r*b+vsslcbj+j 1t9yi frrent 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 plane of the page. In which Region(s) is there a place on the x-axis (aside from infinity) at *v4 s+ylfr19j+sb*jw cgit +b 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 pzww0 k1 n az7 +ter:1a4zoe,jcurrent-carrying wires are shown end on in the figure below. The wjn 1+wr7eoe0ztpa z1zkw4,a: ire 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 el2qewz0b 0llc *ectrical currentl c0lq0zb2 *ew is then run 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 passing through point P inside the solenoidimz (3n 50vc2o2jw npc shown cmn(vz3 5jw icnp02o2is
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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