a loop of wire is increasing, the
induced magnetic field will be
A: in
the same direction as B
B: in
the opposite direction as B
C: perpendicular
to B
D: at
an acute angle to B
E: there
is no induced magnetic field
举一反三
- The<br/>magnetic field lines are used to visually describe the distribution<br/>of the magnetic field around the magnet. For the following<br/>statement,( <br/>) is wrong. A: Each<br/>magnetic field line is a closed loop curve B: No<br/>two magnetic field lines can cross each other C: The<br/>length of the magnetic field line reflects the strength of the<br/>magnetic field D: The<br/>tangential direction of any point on any of the magnetic lines is the<br/>direction of the magnetic field at that point
- Semiconductor<br/>with a current is placed in a magnetic field perpendicular to the<br/>current and it induced electric field in the direction. This<br/>phenomenon is known as the ______ .
- (<br/>) can be determined by the left hand rule. A: The induced force on the moving charged particles in the magnetic<br/>field. B: The direction of the induced force on the moving charged particles in<br/>the magnetic field. C: The induced electromagneto motive force on the moving conductor in<br/>the magnetic field. D: The direction of the induced electro-motive force on the moving<br/>conductor in the magnetic field.
- The<br/>Biot-Savart Law is used to A: determine<br/>the electric field created by individual point charges B: determine<br/>the electric field created by an electric current C: determine<br/>the magnetic field created by individual point charges D: determine<br/>the magnetic field created by an electric current E: determine<br/>the force field created by an electric current
- Regarding the magnetism of the complex, the following statement is<br/>incorrect: ( ). A: The magnetism of complexes is one of the important properties of<br/>complexes B: If all substances are placed separately in a magnetic field, they can<br/>be divided into two groups according to their influence by the<br/>magnetic field: diamagnetic, paramagnetic, and ferromagnetic C: Ferromagnetism is a substance, which is strongly attracted by a<br/>magnetic field D: Most of substances are paramagnetic
内容
- 0
The magnetic field lines are ( ) curves,The<br/>outer space magnetic field line of the permanent magnet is ( <br/>). <br/>A.close-loop/ A: ). <br/>close-loop/<br/>from B: pole<br/>open-loop/<br/>from C: pole<br/>close-loop/<br/>from D: pole to E: pole to F: pole to G: pole to H: pole<br/>open-loop/<br/>from I: pole
- 1
A circular loop of wire is held in a uniform magnetic field, with the plane of the loop perpendicular to the field lines. Which of the following will not cause a current to be induced in the loop? A: crushing the loop B: rotating the loop about an axis perpendicular to the field lines C: keeping the orientation of the loop fixed and moving it along the field lines D: pulling the loop out of the field
- 2
Which of the following explains why a magnetic field does no work on a moving charged particle?( ) A: The magnetic force depends on the speed of the particle. B: There is always an electric field that cancels the work done by the magnetic field. C: The magnetic force is always perpendicular to the direction of motion. D: The magnetic force depends on the direction of motion of the particle. E: The magnetic force is conservative.
- 3
When the medium is magnetized, the molecular magnetic moment inside the paramagnetic material turns to the opposite direction of the external magnetic field
- 4
There exists an induced current flowing clockwise in the conducting loop shown in Figure. What is the direction of the magnetic field through the loop and how does the field vary in magnitude?[img=111x83]1803a3760763dd5.png[/img] A: Into the page and increasing. B: Into the page and decreasing. C: Into the page and steady. D: Out of the page and decreasing.