Question

A wire of resistance 12 ohm is connected in parallel with another wire of resistance "R" ohm if the resultant resistance of the combination is 4 ohm
(a) 18 ohm
(b) 10 ohm
(c) 6 ohm
(d) none of the above​

Answer 1

Answer:

• 6 ohm.

Explanation:

Resistance in parallel:

• R = (R1×R2)/(R1+R2).

=> R(Resultant) = 4(12) + 4X = 12X

=> 48 + 4X = 12X

=> 48 = 8X

=> X = 48/8

∴ X = 6 ohm