Observing that the bulb does not glow in the circuit shown in Fig. 14.11 A, Boojho changed the circuit as shown in Fig 14.11 B. He observed deflection in the magnetic compass
(i) What does the deflection in magnetic compass indicate?
(ii) Why did the bulb not glow in Fig.14.11 A?
(iii) What would be the effect of increase in the number of turns in the coil wound around the magnetic compass in Fig. 14.11B?
(iv)What will be observed if the number of cells are increased in the circuit shown in Fig. 14.11B?
Answers
Explanation:
Ans:
Object Opaque/Transparent/Translucent Luminous/Non Luminous
Moon Opaque Non-Luminous
Firefly Opaque Luminous
Sun Opaque Luminous
Kerosene Stove Opaque Luminous
A wire mesh – Non-Luminous
A sheet of cellophane Transparent Non-Luminous
A lighted torch Opaque Luminous
A sheet of cardboard Opaque Non-Luminous
The flame of a gas burner Opaque Luminous
A sheet of carbon paper Opaque Non-Luminous
A wall Opaque Non-Luminous
A lighted fluorescent tube Opaque Luminous
An umbrella Opaque Non-Luminous
A piece of red hot iron Opaque Luminous
A sheet of plane glass Transparent Non-Luminous
Fog Translucent Non-Luminous
Smoke Translucent Non-Luminous
A CD Opaque Non-Luminous
A sheet of polythene Translucent Non-Luminous
A wooden Board Opaque Non-Luminous
A mirror Opaque Non-Luminous
A sheet of aluminium Opaque Non-Luminous
A piece if rock Opaque Non-Luminous
Water Transparent Non-Luminous
Air Transparent