Lakhmir Singh and Manjit Kaur Solutions for Chapter: Electric Current and Its Effects, Exercise 3: Long Answer Type Questions

What is an electromagnet? Explain in your own words, how to make an electromagnet. Draw a labelled diagram to show the circuit of the electromagnet.

Mention two advantages of an electromagnet over a permanent magnet. What type of magnet is used in an electric bell? Draw a labelled diagram of an electric bell? 

What is meant by the heating effect of current? Name two appliances which work on the heating effect of current. 
 

Explain why, the current that makes the heater element very hot(red-hot), only slightly warms the connecting wires leading to the heater.

What is meant by a battery? How will you arrange two cells to make a battery? Explain with the help of a diagram. Mark the terminals (+ and -) of both the cells. 

Name any five electrical appliances in which the heating effect of current is utilised. 
 

Explain why, when the current is switched on through a wire, the needle of a compass kept nearby gets deflected from its north-south position.