Chapter 22 : Magnetic effect of Electric current

1. Find the force with which two parallel conductors of the same length, carrying the same current interact with each other (i) in the same direction (ii) in the opposite direction.

   Ans : The wires interact with the force per unit length of & (i) attractive force (ii) repulsive force.

2. Find magnetic field at the center of a current carrying a square coil of wire.

   Ans :

Chapter 23 : Heating effect of electric current

1. A calorimeter of mass 50 gm and specific heat capacity 0.1 cal / gm ⁰ C contains water of mass 100 gm; initially the system is at 30⁰C. For how long should a 3 Amp current at 110 volt be passed through the water so that the final temperature of system becomes 70⁰C ?

   Ans : 53.2 seconds

2. Name the household devices working on the principle of the heating effect of electric current.

Chapter 24 : Chemical effects of electric current

1. Can you explain Faraday's laws of electrolysis on the basis of atomic structure of matter.

Chapter 25 : Electromagnetic Induction

1. Explain the principle of a dynamo or a generator.

2. Why does the current in an inductor vary slowly when a D.C. e.m.f. is impressed on it, explain.

1. Explain the terms Reactance and Impedence.

2. A resistance of 100 ohm is connected to a capacitance of 1 f in series. Find the time constant of the circuit. If a 2 volt D.C. e.m.f. source is connected to the circuit, after how long the p.d. across capacitor will become 0.66 volt ?

   Ans : 40 s

3. Can a D.C. circuit containing an inductance and a capacitance in series with a D.C. source of e.m.f. be used as an oscillator (electrical), explain.

4. Find the condition for resonance of a series L-C-R circuit driven by A.C. e.m.f. source e = e⁰ sin (wt).

   Ans :

Chapter 27 : Origin of Magnetism

1. Explain the origin of magnetism in matter.

2. What are the origins of diamagnetism, Paramagnetism, and Ferromagnetism ?

Chapter 28 : Maxwell's field equations and Electromagnetic waves

1. Name the four fundamental experimental laws which form the basis of Maxwell's field equations.

2. What unification was brought about by Maxwell's field theory ?

Chapter 29 : Plank's quantum theory of radiation

1. What is Planck's quantum hypothesis, why was it introduced ?

[next page]

Index

Questions
Bibilography

Chapter 1