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

1#

96.27: A long straight wire conductor is placed below a compassmgd k *be/nq-dx(7n.t . When the conventional nn */xed7db-q ( gmk.tcurrent 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 hasf/xc 5) vp7ul d*m;jllf along the dotted lines shown. None of the pieces ar) /ljl* x psdfm5vc7u;e 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 filings sprinkled18 hxhbo+m ys0 around three permanent magnets. Pole R is the h8myx0+obsh1same 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 conventionaann 5erg en4- flf)(4wl (positive) electric current flows from left to right in a wire as shown in the diagram, what is the direction of the magnetic field at ponl(fn)w-ga4 er5 n e4fint 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 horifufcac z g )y3i e14u(y.(bv.xzontal wire from left to right as shown in the accompanying diagram. Which option best represents the direction of the f 4g (ievu..)c (zx1y3ucaf ybmagnetic 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 represent)lh1 g7j 7s7y/pj 5ykv5 yl+yzfocjb( ation of magnetic field lines is inconsistent? The sq5gcj7 y 5z+ob(jlp 7hljf/) 7ky yvy1suares 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 convllie+p*,lo 1 kentional current directed into the plane of the page as shown in the figure. Which one of the arrows shown best indicates the direction ofp,+kli* o 1ell 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 conventional current in tkh;c*,d 3rgx xhe left wire (2 A) comes x; 3hrkgx*,cdout 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 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 sha0t h3ovp xxe ii7;)u;own end on in the figure below. The v; eupt7hx;0)3 oiaxiwire 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 t yi jq5a8wn9 jrx,j.7conventional electrical current is then run through the coil from left ty.9itq7 r8 jajn5,xw jo 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 theaa6 f*oe fpgq (x2-,jr solenoid shown isjo(*2xqr,-f6 afg pae
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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