Question

pls answer in five minutes because I needed fastly and answer correctly​

Answer 1

Answer:

Hey Mate!!

7) WKT, R = ρl\A

Where, R = Resistance, ρ = Resistivity, l = length and A = Area of cross-section.

⇒ R ∝ l

So, when length if l, Resistance is 20Ω. If length becomes 2l, Resistance also doubles, i.e, it becomes 40Ω.

8) An electric circuit is a closed path through which there is a flow of electricity or electrons.

An open circuit is one in which the switch/key is not plugged in and the appliances connected to it are not working.

A closed circuit is one in which the switch/key is plugged in and appliances connected to it are working.