Question

please answer the question
12 points
​

Answer 1

Connecting cords simply mean connecting wires
So silver and Copper are the best for making wires because they are the best conductor of electricity.

Answer 2

1. Material A is best for making connecting cords, because it will allow current to pass through it

2. Heat is directly proportional to Resistivity, so Material E is best for heating elements.

3. Resistance = ϱ l/A

In the first case,

2 ohm = 1.6 × 10^-8 l/A

l/A = 2/1.6 × 10^-8

l/A = 1.25 × 10^8 -----(1)

Now,

For Material D

R = ϱ l/A

From (1), l/A = 1.25 × 10^8

= 96 × 10^-8 × 1.25 × 10^8

= 96 × 1.25

= 120 ohm