In an electric resistance of 20 ohms, if the current intensity passing through it is doubled, its value becomes ohms.
b. 20
d. 40
a. 10
c. 30​

a.  10 ohms.

Explanation:

Given;

first electrical resistance, r₁ = 20 ohms

let the first current through the circuit = I₁

let the second current through the circuit, I₂ = 2I₁ (since it is doubled)

then, the new value of the resistance after doubling the current = r₂

the current intensity is given as;

Therefore, the new value of the resistance is 10 ohms.

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2