Question

Q3. In the a.c. circuit shown below, the main supply has
a constant voltage but variable frequency. For what
frequency will the voltage across the resistance R be
maximum? [Ans.500Hz]
L=1/TTH
000
C=1/TTUF
1
R
L
C С​

Answer 1

Answer:-

REF.Image

The frequency across R will be maximum

(equal to the supplied voltage) at

resosnance - condition.

V

R

=R

R

2

+(ωL−

ωC

1

)

2

V

V

R

be max when ωL−

ωC

1

=0

⇒ω

2

=

LC

1

⇒ω=

LC

1

=

π

1

×10

−6

×

π

1

1

⇒ω=π×10

3

rad LS⇒f=

2π

ω

=500Hz