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

1#

96.27: A long straight wire conductor is placed below a compass. When the con3t z8cjq0;bd xvent3qjc; ztbd 08xional current in the 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 0/+ znoanuoq(7pl8ocjg *nj sy:-kx)along the dotted lines shown. None of the pieces ar yl(x/json +ogan)*78 n:z c-uopj0qke 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 right depicts iron fi lo,t0j rww0/tlings sprinkled around three permanent magnets. Pole R is the same as poles tjwl0o, /0wrt

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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 current flow-8zqv8*brcd k s from left to right in a wire as shown in the diagram, whadc88bkzr -v q*t 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 cob 0r8y/llo u ufv4:n.urrent flows through a horizontal wire from left to right as shown in the accompanying diagram. W bul/l:o 4vr8y0n. fouhich 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 physr x6bu9na(kd;wnyp6 3ics, which representation of magnetic field lines is inconsistent? The squares in the diagrams below simply represent regions(b;p kxua6 93n6ndrw y 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 straighgp68)tzwe 4zj hsv jwc z i;232d4kq7mt wire has a conventional current directed into the plane of the page as shown in the figure.8d26p4q sj7jg h)mkziz24v w 3;t ewzc 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 wires are fixed in space so that the conventionalds e t w*mf)j63jbl+cya6bk+; 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 plane of the page. In which Region(s) is there a place on the x-axis (aside from infinity) at which the fl )6bj ja*w+6dts+bym ;kc3e 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-carr/i +vpc/ca rarp: 00qfying wires are shown end on in the figure below. aqicc/rp0rf 0 ap:/v+The 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 coil of wire. Ao66 3byoi ew h0ab3)f0mw 4gfp conventional electrical current is then run through the co0w i6a pe fbw3fb634)0moyghoil 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 f(vvhxf*20).-hv ks umy ii6ne ield line passing through point P inside the solenoid shown 6)*ie.fh u2hxm vkyv- v(s0i nis
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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