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"Magnetic Force of Electromagnets (1)" Energy PPT Courseware 4
Review of the previous section
1. The device consisting of a coil and an iron core is called ______.
2. The electromagnet generates magnetism when the current is turned on, and disappears when the current is turned off.
3. Changing the positive and negative pole connections of the battery or changing the direction of the coil winding will change the north and south poles of the electromagnet.
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 _______________.
Things you should pay attention to when doing experiments:
1. It’s only scientific if you do it a few times
2. Do not turn on the electromagnet for a long time to avoid excessive power consumption.
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. ( )
1. Which of the following cannot change the magnetic force of the electromagnet ( ).
A. Increase the number of battery cells B. Change the coil winding direction C. Increase the number of coil winding turns
2. Which of the following cannot change the magnetic pole of the electromagnet ( ).
A. Change the direction of the current B. Change the direction of the coil winding C. Increase the number of turns of the coil
3. Only change the direction of the electromagnet current, electromagnet ( ).
A. The North and South Pole changes B. The South and North Pole remains unchanged C. The strength of the magnetic force changes
4. Xiao Ming first changes the winding direction of the electromagnet coil, and then changes the current direction of the electromagnet. At this time, the electromagnet is ( ).
A. The North and South Pole changes B. The South and North Pole remains unchanged C. The strength of the magnetic force changes
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