Which type of metal or alloy cannot be used to prepare a fuse wire?

$(a)$ Mention the colour code used for live,neutral,and earth wire.
$(b)$ You want to connect a $2 \ kW$ electric oven in the electric circuit. In which power line would you connect it and why? What may happen if you connect it wrongly in the other power line?

The diagram below shows two ways of connecting three bulbs $A, B$ and $C$ to a $220 \,V$ main in a room. Name the two arrangements. Which of them would you prefer for household electricity? Give two reasons.

State Faraday's first law of electromagnetic induction.

Name two safety measures commonly used in electric circuits and appliances. What precautions should be taken to avoid the overloading of domestic electric circuits?

No two magnetic field lines can intersect each other. Explain.