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
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
举一反三
- A square current loop with length a on each side carries a current I. The loop is in a uniform magnetic field B. If the loop is in the stable equilibrium, the magnetic flux passing through the loop onlyby the uniform field is ( ). A: [img=30x22]1803a3748913c57.png[/img] B: 0 C: [img=44x24]1803a37490df0b1.png[/img] D: indeterminable
- If the magnetic field B through<br/>a loop of wire is increasing, the<br/>induced magnetic field will be A: in<br/>the same direction as B B: in<br/>the opposite direction as B C: perpendicular<br/>to B D: at<br/>an acute angle to B E: there<br/>is no induced magnetic field
- 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
- 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.
- In a uniform magnetic field, can an Amperian loop ever have a non-zero value of its line integral with the magnetic field? (You get only one try on this one!) A: Yes. B: No, it will always be zero. C: Depends on the orientation and shape of the loop.