Chapter 14: Electromagnetism

This is a fourteenth 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:

• Appreciate that a force might act on a current carrying conductor placed in a magnetic field.
• Define magnetic flux density and the tesla.
• Derive and use the equation $F= BI L \sin \theta $ with directions.
• Understand how the force on a current carrying conductor be used to measure the magnetic flux density of a magnetic field using a current balance.
• Describe and sketch flux patterns due to a long straight wire.
• Define magnetic flux and the weber
• Derive and use the relation $\theta = B.A $.
• Understand and describe Ampere's law.
• Appreciate the use of Ampere's law to find magnetic flux density inside a solenoid.
• Appreciate that there acts a force on a charged particle when it moves in a uniform magnetic field and in field.
• Describe the deflection of beams of charged particles moving in a uniform magnetic field.
• Understand and describe method to measure $e/m.$
• Know the basic principle of cathode ray and appreciate its use.
• Derive the expressi0n of torque due to couple acting on a coil.
• Know the principle, construction and working of a galvanometer.
• Know how a galvanometer is converted into a voltmeter and an ammeter.
• Describe and appreciate the use of AVO meter/multimeter.
• Read through analogue scale and digital display on electrical meters.