A coil has a resistance of 60 $\Omega$ and an impedance of 100 $\Omega$ .Its reactance is:
A)40 $\Omega$
B)60 $\Omega$
C)80 $\Omega$
D)117 $\Omega$
E)160 $\Omega$

Question

A coil has a resistance of 60  $\Omega$  and an impedance of 100  $\Omega$ .Its reactance is:
A)40  $\Omega$ 
B)60  $\Omega$ 
C)80  $\Omega$ 
D)117  $\Omega$ 
E)160  $\Omega$

Quizplus · Accepted Answer

We know that impedance, Z = R + jX, where R is resistance and X is reactance.
Here, Z = 100 ohms and R = 60 ohms.
So, 100 = 60 + jX
X = 100 - 60 = 40 ohms.
Therefore, the reactance of the coil is 40 ohms. Hence, the best choice is C.

A Coil Has a Resistance of 60 Ω\OmegaΩ And an Impedance of 100

A Coil Has a Resistance of 60 $\Omega$ And an Impedance of 100