Lakhmir Singh and Manjit Kaur Solutions for Chapter: Magnetic Effect of Electric Current, Exercise 7: Short Answer Type Questions

State and explain the Clock face rule for determining the polarities of a circular wire carrying current.

Name any two factors on which the strength of a magnetic field produced by a current-carrying solenoid depends. How does it depend on these factors?

(a) Draw a circuit diagram to show how a soft iron piece can be transformed into an electromagnet.
(b) Describe how an electromagnet could be used to separate copper from iron in a scrap yard.

How does an electromagnet differ from a permanent magnet?

Name two devices in which electromagnets are used and two devices where permanent magnets are used.

What is a solenoid? Draw a sketch to show the magnetic field pattern produced by a current-carrying solenoid.

Name the type of magnet with which the magnetic field pattern of a current-carrying solenoid resembles.

What is the shape of field lines inside a current-carrying solenoid? What does the pattern of field lines inside a current-carrying solenoid indicate?