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"Magnetic Force of Electromagnets (2)" Energy PPT Courseware 2
The size of the magnetic force is related to the number of coils
Number of coil turns______, magnetic force______;
The number of turns of the coil is ______, and the magnetic force is ______.
fill in the blank:
1. The device composed of a coil and an iron core is called _______. It produces _______ when it is powered on and _______ disappears when the power is turned off.
2. Electromagnets also have north and south poles. The north and south poles of electromagnets are related to ______________ and _______.
1. Which of the following can change the magnetic force of the electromagnet ( ).
A. Change the direction of current
B. Change the coil winding direction
C. Increase the number of turns of the coil
2. Which of the following cannot change the magnetic poles of the electromagnet ( )
A. Change the direction of current
B. Change the direction of coil winding
C. Increase the number of turns of the coil
3. Only change the direction of the electromagnet current, electromagnet ( ).
A. Changes in the North and South Poles
B. The North and South Pole remain unchanged.
C. The strength of the magnetic force changes
The magnetic force of an electromagnet is related to the number of turns of the coil, the strength of the current, and the presence or absence of an iron core.
1. The more turns of the coil, the greater the magnetic force; the fewer the number of coil turns, the smaller the magnetic force.
2. The stronger the current, the greater the magnetic force; the weaker the current, the smaller the magnetic force.
3. With an iron core, the magnetic force is strong; without an iron core, the magnetic force is small.
judge
1. The more pins the electromagnet attracts, the greater the magnetic force. ( )
2. With the same number of batteries, the more electromagnet coils, the smaller the magnetic force. ( )
3. When studying the relationship between magnetism and the number of coil turns, the number of batteries used should be the same. ( )
4. The magnetic force of the electromagnet may be changed. ( )
5. When conducting experiments to study the magnetic force of electromagnets, do not turn on the electromagnet for a long time. This will consume too much battery power and affect the accuracy of the experiment. ( )
Xiao Ming guessed that the magnetic force of the electromagnet may be related to factors such as the number of turns of the coil wound on the iron core and the intensity of the current in the coil. Please choose one of the factors and help him design an experiment to study it
Research question: Is the magnetic force of an electromagnet related to the strength of the current?
Changing conditions: Number of cells (current intensity) of the battery
Unchanged conditions: the number of winding turns of the coil is the same (40 turns), the iron core is the same, the winding direction of the coil remains unchanged, the length of the wires is the same
Specific operation method: Use 1 battery, 2 batteries, and 3 batteries to measure the number of pins that are attracted to the electromagnet.
The conclusion drawn: the magnetic force of the electromagnet is related to the strength of the current. The stronger the current, the greater the magnetic force; the weaker the current, the smaller the magnetic force.
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