Question

give reason for the following
(a) for a fuse wire we should choose a wire which made easily
(b) if we bring a magnetic compass near an electric circuit the needle moves

Answer 1

Answer:

i) Not wire which is made easily but use a wire which conducts electricity.

ii)The needle moves because a current is flowing through the needle making it move.

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Explanation:

Answer 2

(a) A fuse wire should be made of a wire that melts easily because its function is to break the circuit when extra current flows in the circuit and hence save the appliances.

So, when more than required flows into the circuit, due to Joule's law of heating, more heat is generated. This heat melts the fuse wire; the circuit becomes open and the appliances are saved from being harmed.

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(b) A current carrying wire has a magnetic field around it. Magnetic field is a region in which magnetic objects experience force. The compass needle moves because it experiences force due to the magnetic field of the current carrying conductor.