Question

please tell me Please me the answer of ( a ) please ​

Answer 1

Explanation:

A) bulb helps us to test the electricity passage through it's glowing system, and the magnet shows a deflection in it's needle when comes in contact with the flow of electricity.

Magnet is more efficient than the bulb, because magnet could deflect even in the presence of small amount of electricity but bulb needs a few more power to get lighted up.

It may happen that the bulb does not glow even if the liquid is a good conductor of electricity because of lack of sufficient power.