Chapter 15: Electromagnetic Induction

This is a fifteenth chapter of the book Physics 12 published by Punjab Curriculum and Textbook Board, Lahore, Pakistan.

After studying this chapter, the students will be able to:

• Recall that a changing magnetic flux through a circuit causes an emf to be induced in the circuit.
• Know that the induced emf lasts so long as the magnetic flux keeps changing.
• Determine Motional emf.
• Use Faraday's law of electromagnetic induction to determine the magnitude induced emf.
• Apply Lenz's law to determine the direction of induced emf.
• Recognize self and mutual induction.
• Define mutual inductance, self-inductance and its unit henry.
• Know and use the formula $E=\frac{1}{2} LI^2$
• Calculate the energy stored in an inductance.
• Describe the principle, construction and operation of an AC and DC generator.
• Describe the principle, construction and operation of DC motor.
• Recognize back emf in motors and back motor effect in generators.
• Describe the structure and principle of operation of transformer.
• Use $\frac{N_s}{N_p}= \frac{V_s}{V_p}$ and $V_p I_p=V_s I_s$ for an ideal transformer.
• Apply transformer equation to solve the problems.
• Understand and describe eddy currents and use of laminated core.