KCET 2017 Physics Solved Paper

Given, inductive reactance, ωL=

1

√3

Ω; resistance, R = 1Ω; ac voltage, V = 200 V, 50 Hz ;
Now, tan‌ϕ=

ωL

R

⇒tan‌ϕ=

1

√3

⇒ϕ=30∘ or ϕ=

π

6

⇒ωt=‌

π

6

⇒t=

π

6

×

1

ω

Since ω=2πf=2π×50
t=‌

π

6

×

1

2π×50

=

1

600

s
Therefore, time lag between maximum voltage and current is 1/600 s.