Observing that the bulb does not glow7 in the circuit shown below in A

cbse
cbse-class-8-science
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#1

Observing that the bulb does not glow7 in the circuit shown below in A, Boojho changed the circuit as shown in B. He observed deflection in the magnetic compass.

  1. What does the deflection in magnetic compass indicate?
  2. Why did the bulb not glow in A?
  3. What would be the effect of increase in the number of turns in the coil wound around the magnetic compass in B?
  4. What w’ill be observed if the number of cells is increased in the circuit shown in B?

Answer:

  1. It indicates the presence of current in the circuit.
  2. The bulb did not glow because the current was not sufficient to make it glow.
  3. Deflection in the magnetic compass will increase.
  4. Deflection in the compass will increase further.