Home
Class 12
PHYSICS
An e.m.f. E=4cos(1000t)volt is applied t...

An e.m.f. `E=4cos(1000t)`volt is applied to an `LR` circuit of inductance `3mH` and resistance `4ohm`. The amplitude of current in the circuit is

A

`4 sqrt(7) A `

B

`1.0 A`

C

`4/7 A `

D

`0.8 A`

Text Solution

Verified by Experts

The correct Answer is:
D
`i_0 = (v_0)/(Z ) `
` Z= sqrt(R^2 +(omegaL)^2)`
` = sqrt(4^2 +(1000 xx 3 xx 10^(-3))^2)= 5 Omega `
` i_0 = 4/5`
`i_0 = 0.8 A`
Promotional Banner

Similar Questions

Explore conceptually related problems

An A.C. voltage V=5cos(1000t)V is applied to an L-R series circuit of inductance 3 mH and resistance 4Omega . The value of the maximum current in the circuit is ……………. A.

An L-R circuit consists of an inductance of 8mH and a resistance of 4 Omega . The time constant of the circuit is :-

An e.m.f. of 15 volt is applied in a circuit containing 5 henry inductance and 10 ohm resistance. The ratio of the current at time t=oo and at t=1 second is

An alternating e.m.f. E=10sqrt(2) sin omega volt is applied to a circuit containing a pure inductance L and a resistance and voltage acros the resistance is 6 v between the current and potential difference in this circuit is

An e.m.f. E = 200 sin 377 t volt is applied across an inductance L having a resistance of 1.0 ohm. The maximum current is found to be 10 A. Find the value of L.

An alternating e.m.f. given by e=200 sin 50 t is applied to a circuit containing only a resistance of 50 Omega . What is the value of r.m.s. current in the circuit?

In a LR circuit of 3 mH dinductance and 4 Omega resistance, emf E=4cos 1000t volt is applied. The amplitude of current is

A circuit consists of 3 ohm resistance and 4 ohm reactance The power factor of the circuit is

" A circuit consists of "3" ohm resistance and "4" ohm reactance The power factor of the circuit is "

An e.m.f. E =E_(0) cos omega t is applied to a circuit containing L and R in series. If X_(L)=R , then the power dissipated in the circuit is given by