First slide

Phasors and Phasor Diagrams

Question

The reactance of a coil when used in the domestic AC power supply (220 volt, 50 cycles) is 100 ohm. The self-inductance of the coil is nearly (Assume negligible resistance of coil)

Easy

A

3.2 henry
B

0.32 henry
C

2.2 henry
D

0.22 henry

Solution

Reactance $= 2 πvL \Rightarrow 100 Ω = 2 \times \frac{22}{7} \times 50 \times L$
$∴ L = 0 .32 henry$

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