Question

w1.Find the equivalent resistance of three resistors having resistance 6 ohm

each when connected in parallel?(1)

2.Wire of resistivity rho is stretched to double its length what will be

the new resistivity?(1)

3.Name the device which is used to measure the potential difference​

Answer 1

Explanation:

1)Now to get 6 ohms, connect 6ohms and 6 ohms in pararrel and connect that combination parallel to the thirdas shown in attachment. now this effective resistance 3 is kept parallelto the last 6 ohm resistor. so R=2ohms.

2)When the wire is stretched to double the length , the area of cross section gets reduced to half. So when the wireis stretched, the resistance multiplies by four times. Hope you understood. Keep exploring.

3)A voltmeter is an instrument used for measuring electricalpotential differencebetween two points in an electric circuit. An ammeter is ameasuring device used to measurethe electric current in a circuit.