Pankaj Bhatt Solutions for Chapter: Electromagnetism, Exercise 3: QUESTIONS

State two characteristics of a primary coil of a step-up transformer when compared to the secondary coil.

What is electromagnet? State two ways in which the strength of an electromagnet can be increased.

Figure shows two wires carrying current. Copy the diagram and draw the pattern of line of force around them and mark their direction.

Draw a neat labeled diagram of a.c. generator. What is the magnitude of emf induced in the coil when its plane becomes parallel to the magnetic field?

Explain how the use of transformer is helpful in preventing the transmission loses.

A conducting loop is placed just straight in current carrying conductor. Find the direction of induced current, if any, when current in straight wire is (i) increasing (ii) decreasing (iii) steady?

Name the parts A, and B of the transformer shown in figure.

State whether this transformer is step-up or step-down?

You are given a long solenoid connected to an electric bulb and a strong magnet. Describe a method to light the bulb for a moment. Name the phenomenon involved in this experiment.