Class 12 Physics Chapter 15 Notes

Handwritten notes of the Class 12 Physics Chapter 15 Notes written by Professor Shahroze Saleem Suib. These notes are very helpful in the preparation of Class 12 Physics Chapter 15 Notes for the students of the intermediate and these are according to the paper patterns of all Punjab boards.

• Important class 12 physics chapter 15 mcqs for Intermediate part-I students.
• Induced EMF and induced current
• Definition of Motional EMF
• Faraday's law and induced EMF
• Important class 12 physics ch 15 notes for Intermediate part-I students.
• Lenz's law and direction of induced EMF
• Mutual induction
• Self-induction
• Energy stored in an inductor
• Important chapter 15 class 12 physics notes for Intermediate part-I students.
• Alternating current generator
• DC generator
• Back motor effect in generators
• Important class 12 physics chapter 15 exercise solutions for Intermediate part-I students.
• DC motor  and back EMF effect in motors
• Transformer
• A solenoid of length 8.0cm and cross sectional area 0.5cm^2 has 520 turns. Find the self-inductance of the solenoid when the core is air. If the current in the solenoid increases through 1.5A in 0.2s, find the magnitude of induced emf in it.
• Important physics class 12 chapter 15 important questions for Intermediate part-I students.
• When current through a coil changes from 100 mA to 200 mA in 0.005s, an induced emf of 40 mV is produced in the coil. (a) What is the self-inductance of the coil? (b) Find the increase in the energy stored in the coil.
• Important physics class 12 chapter 15 exercise solutions for Intermediate part-I students.
• Induced EMF and Induced current: There are many ways to produce Induced emf. illustrates one 01 them. Consider a Straight piece of wire of length l placed in the magnetic field of a permanent magnet. The wire is connected to a Sensitive galvanometer. This forms a closed path or loop without any battery. In the beginning when the loop is at rest in the magnetic field, no current is shown by the galvanometer. If we move the loop from left to right. The length of the wire is dragged across the magnetic field and a current flows through the loop. As we stop moving the loop current also stop now if we move the loop in opposite direction current also reverses its direction this is indicated by the direction of the Galvanometer in the opposite direction.
• Important physics class 12 chapter 15 notes for Intermediate part-I students.
• The induced current depends upon the speed with which conductor move and upon the resistance of the loop. If we change the resistance of the loop by in inserting different resistance in the loop and move it in the magnetic field with the same speed every time. we find that the product of induced Current I and the resistance R of the loop remains constant, i.e., I x R = Constant , This concert is the induced EMF The induced EMF leads to an induced current when the circuit is closed the current can be increased by: (i) using strong magnetic field  (ii) move the loop faster  (iii) replacing the low by coil of many terms
• Important class 12 physics ch 15 exercise solutions for Intermediate part-I students.
• ΜΟΤΙONAL EMF: In the previous section we have studied that when a conductor is moved across a magnetic field, an e.m.f is induced between its ends. The e.m.f of the moving conductor is similar to that of a battery, i.e., if the ends of the conductor are joined by a wire to make a closed circuit, a current flows through it. The e.m.f induced by the motion of a conductor across a magnetic field is called motional e.m.f. Consider a conducting rod of length L placed on two parallel metal rails separated by a distance L.A galvanometer is connected between the ends c and d of the rails. This forms a complete conducting loop abcda.
• Important physics class 12 chapter 15 important long questions for Intermediate part-I students.