EASY
7th CBSE
IMPORTANT
Earn 100

A coil of wire wound around a soft iron bar is called an electromagnet. When does an electromagnet act like a magnet?

Important Questions on Electric Current and Its Effects

EASY
7th CBSE
IMPORTANT
Living Science 7>Chapter 17 - Electric Current and Its Effects>ORAL QUESTIONS>Q 3
A straight wire carrying a current acts like a magnet. Then why is a coil of wire used in an electromagnet instead of just a straight wire?
EASY
7th CBSE
IMPORTANT
Living Science 7>Chapter 17 - Electric Current and Its Effects>EXERCISES>Q A
Which of these is not a circuit element?
EASY
7th CBSE
IMPORTANT
Living Science 7>Chapter 17 - Electric Current and Its Effects>EXERCISES>Q A
The necessary requirement for a fuse wire is 
EASY
7th CBSE
IMPORTANT
Living Science 7>Chapter 17 - Electric Current and Its Effects>EXERCISES>Q A
The strength of a magnetic field due to a solenoid can be increased by
EASY
7th CBSE
IMPORTANT
Living Science 7>Chapter 17 - Electric Current and Its Effects>EXERCISES>Q A
Which of these appliances does not use an electromagnet?
 
EASY
7th CBSE
IMPORTANT
Living Science 7>Chapter 17 - Electric Current and Its Effects>EXERCISES>Q A
Which of these is absolutely necessary in an electric circuit?
MEDIUM
7th CBSE
IMPORTANT
Living Science 7>Chapter 17 - Electric Current and Its Effects>EXERCISES>Q A
The same current is passed through the following. Which will show the strongest magnetic strength?
MEDIUM
7th CBSE
IMPORTANT
Living Science 7>Chapter 17 - Electric Current and Its Effects>EXERCISES>Q B

Which insulator does a switch use to cut off the current in a circuit?

(Choose from the following: Copper wire/ Air/ Plastic/ Glass)