Question

A series resistance of 8.5 Ω is required for connecting an arc lamp having the rated voltage
and current of 42 V and 10 A respectively to a circuit. The voltage in the circuit is:

Answer 1

Answer:

Answer

Correct option is

D

0.065H

Resistance of lamp by ohm's law,

R=

I

V

=

10

80

=8Ω

When inductor is connected in series and source is applied,

V=IZ

V=I

R

2

+(ωL)

2

Given, I=10 A for lamp to work,

∴220=10

8

2

+(2×π×50×L)

2

Solving,

L=0.0648 H