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
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
举一反三
- 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.
- 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.
- _________ means noting down the page or arranging the notes vertically from top to bottom, rather than horizontally from left to right.
- Links are ____ or _____ in one page that connect to another page or a different location within a single page.
- 下面的page指令哪个是合法的?( ) A: <;%@ page import="java.util.* java.text.*”%>; B: <;%@ page import="java. util.*","java.text.*”%>; C: <;%@ page buffer="8kb" ,session= "false”%>; D: <;%@ page import="com.manning.servlets.*”%>;<;%@ page session="true”%>;<;%@ page import="java. text.*”%>; E: <;%@ page bgcolor="navy"%>; F: <;%@ page buffer= "true”%>; G: <;%@ Page language=’java'%>;