Fill in the blank: An electromagnet consists of a coil of wire wrapped around a ___ core. | Card: 1 / 28 |
The polarity of an electromagnet can be changed by reversing the direction of the electric current flowing through the coil. | Card: 4 / 28 |
True or False: The Earth's magnetic field is generated by the movement of solid iron in its core. | Card: 5 / 28 |
Lifting electromagnets are common tools.
| Card: 8 / 28 |
Conductors heat up with current.
| Card: 12 / 28 |
Fill in the blank: A dry cell is called 'dry' because its electrolyte is a ___ paste. | Card: 13 / 28 |
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Insert copper and iron in lemon juice.
| Card: 16 / 28 |
Resistance is the property of a material that opposes the flow of electric current, causing energy to be converted into heat. | Card: 18 / 28 |
Multiple Choice: Which of the following increases the strength of an electromagnet? | Card: 19 / 28 |
True or False: Rechargeable batteries can be used only once before being discarded. | Card: 21 / 28 |
Fill in the blank: The warming up of a conductor due to the passage of electric current is called the ___ effect of electric current. | Card: 23 / 28 |
Electrodes are crucial in electric cells.
| Card: 26 / 28 |
The magnetic effect of an electric current is the phenomenon where electric current flowing through a conductor produces a magnetic field around it. | Card: 28 / 28 |






