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.
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.
举一反三
- An electron moves in the plane of this paper toward the top of the page. A magnetic field is also in the plane of the page and directed toward the right. What is the direction of the magnetic force on the electron? A: toward the top of the page B: toward the bottom of the page C: upward out of the page D: downward into the page
- 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
- 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
- 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 wire carries current in the plane of this paper toward the top of the page. The wire experiences a magnetic force toward the right edge of the page. The direction of the magnetic field causing this force is: A: in the plane of the page and toward the left edge. B: in the plane of the page and toward the bottom edge. C: upward out of the page. D: downward into the page.