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

1#

96.27: A long straight. - c*gdubj.5 lcd,iwi wire conductor is placed below a compass. When the conventional current in the conductor is from south to north and l cuj il.dbc*iw.d,-g5 arge, 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 along the dotted lines s+r,qhf- nkj h)qxu.d6hown. None of the pieces are rotated. After the cn+hju qkqdfxr,)h-. 6ut:

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 sb22+; 0e,)lkylmxld r krj5hj4x;jo bprinkled around three permanent hrdo24ljy 5 k2jk;0+xl) e ;xbjmb ,rlmagnets. 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) ele3a5k+c tnk5nxtoj66xctric current flows from left to right in a wire as shown in the diagram, what is the directxn65t n ocj63 a+5txkkion 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 curren a ctzki f e5a1t9b,479cdu)i,jz5vlxt flows through a horizontal wire from left to right as shown in the accompauc4j1at)za,biv9ilkz c7,e55d tf9 xnying diagram. Which 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 physics, which representation of magr7tw xa8;dzf5u8 buxs 2r3l0wnetic field lines is inconsiste8 xwuz;bs0wu r a527x83fldrt 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 wpa;- kn7lcdw 3rvq 3obcfrg4*u+mq/ 6ire has a conventional current directed into the plane of the page as shown in the figure. Which one of the arrows shown best indicates q3o /c qcvgr* 3+ wkradbup7nf-;ml4 6the 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 conventional current in thex., .8tvylutlh- 5d hx 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 magnetic fit hhd x,ut.vy.xl58l-eld 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 on in th.mq :ek uwi nc8i,k-v1e figure below ,wnc8:qk1-imu.vi ke . 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. A conventioj* c1xhu/ bh.y o2pb9t8lx.vpnal electrical current is then run through the coil from left to right as shown. This will cause the North pole yv8 xc9 lpbu/tjb.*xohp.2 h1of 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 p st tfg vt jf3)18.ccyz4k+av-oint P inside the solenoid shown i vfsct.4gta8 y+tc1-3 kj )fzvs
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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