The magnetic field lines are ( ) curves,The
outer space magnetic field line of the permanent magnet is (
).
A.close-loop/
A: ).
close-loop/
from
B: pole
open-loop/
from
C: pole
close-loop/
from
D: pole to
E: pole to
F: pole to
G: pole to
H: pole
open-loop/
from
I: pole
outer space magnetic field line of the permanent magnet is (
).
A.close-loop/
A: ).
close-loop/
from
B: pole
open-loop/
from
C: pole
close-loop/
from
D: pole to
E: pole to
F: pole to
G: pole to
H: pole
open-loop/
from
I: pole
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
- 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
- 下列循环能正常结束循环的是(). A: i=5<br>Do<br>i=i+1<br>Loop Until i<0 B: i=1<br>Do<br>i=i+2<br>Loop Until i=10 C: i=10<br>Do<br>i=i+1<br>Loop Until I>0 D: i=6<br>Do<br>i=i-2<br>Loop Until I=1
- Singapore is (far) _____ away from the south Pole than from the North Pole.
- The North Pole is surrounded by land, while the South Pole is surrounded by the Antarctic Ocean. So scientists thought that______. A: most of the ice melted in the Northern hemisphere B: most of the ice melted in the Southern hemisphere C: The North Pole is colder than the South Pole D: The South Pole is colder than the North Pole