Answer:
C) 27 A
Step-by-step explanation:
ΔV = Potential difference across the cylindrical resistor = 10 V
i = current through the resistor = 3 A
R = Resistance of the resistor
Using ohm's law
ΔV = i R
10 = 3 R
R = 3.33 ohm
The resistance of a resistor is inversely related to square of the diameter. So as the diameter is tripled, the resistance becomes 1/9 times
R' = New resistance of the resistor =

i' = new current through the resistor
Using ohm's law
ΔV = i' R'


i' = 27 A