Home
Class 12
PHYSICS
A coil has an inductance of 0.7 H and is...

A coil has an inductance of `0.7 H` and is joined in series with a resistance of `220 Omega`. When an alternating e.m.f of `220 V` at 50 c.p.s. is applied to it, then the wattless component of the current in the circuit is

A

7A

B

5A

C

0.7A

D

0.5A

Text Solution

Verified by Experts

The correct Answer is:
D
Here, `X_L = 2pi v L = 2pi xx 50 xx 0.7 = 220 Omega, R = 220 Omega`
`Z = sqrt(R^2 + X_L^2) = sqrt(220^2 + 220^2) = 220 sqrt2 Omega`
`I_(rms) = (V_(rms))/(Z) = (220V)/(220sqrt2 Omega) = (1)/(sqrt2) A`
`sin phi = (X_L)/(Z) = (220)/(220 sqrt2) = (1)/(sqrt2)`
Wattless current ` = I_(rms) sin phi = (1)/(sqrt2) xx (1)/(sqrt2) = 1/2 A = 0.5 A`
Promotional Banner

Topper's Solved these Questions

  • ELECTROMAGNETIC INDUCTION AND ALTERNATING CURRENTS

    MTG GUIDE|Exercise NEET CAFE TOPICWISE PRATICE QUESTIONS (AC GENERATOR AND TRANSFORMER)|14 Videos

  • ELECTROMAGNETIC INDUCTION AND ALTERNATING CURRENTS

    MTG GUIDE|Exercise CHECK YOUR NEET VITALS|25 Videos

  • ELECTROMAGNETIC INDUCTION AND ALTERNATING CURRENTS

    MTG GUIDE|Exercise NEET CAFE TOPICWISE PRATICE QUESTIONS (POWER IN AC CIRCUITS)|13 Videos

  • DUAL NATURE OF MATTER AND RADIATION

    MTG GUIDE|Exercise AIPMT/ NEET MCQs|30 Videos

  • ELECTROMAGNETIC WAVES

    MTG GUIDE|Exercise AIPMT/NEET(MCQs)|15 Videos

Similar Questions

Explore conceptually related problems

A coil has an inductance of 22/pi H and is joined in series with a resistance of 220 Omega .When an alternating e.m.f of 220 V at 50 c.p.s is applied to it.then the wattless component of the rms current in the circuit is

A coil has a iductance of 0.7H and is joined in series with a resistance of 220 Omega . When an alternating emf of 220V at 50 cps is applied to it, then the wattless component of the current in the circuit is (take 0.7 = 2.2)

A coll has an inductance of (2.2)/(pi)H and is joined m series with a resistance of 220Omega . When an alternating e.m.f. of 220 V at 50 c.p.s. is applied to it, then the wattless component of the runs current in the circuit is

A coil has an inductance of 0.7H and is joined in series with a resistance of 220Omega .When an alternating emf of 220V at 50cps is applied to it,then the wattles component of the current in The circuit is (take 0.7 pi=2.2 )

A coil has inductance of (11)/(5pi)H and is joined in series with a resistance of 220Omega . When an alternating emf of 220V at 50Hz is applied to it, then the wattless component of the current in the circuit is

A coil has an inductance of 0.5 H is connected in series with a resistance of 50 Omega to 240 V, 50 Hz AC. The maximum current in the circuit is

A coil has an inductance of 0.7 H and is joined in series with a resistance of 220 ohm. Find the wattless component of current in the circuit, when an alternating e.m.f. of 220 V at a frequency of 50 Hz is supplied to it.

An inductance of 0.4/(pi) henry and a resistace of 30 Omega are joined in series. If an alternating e.m.f. of 200 V, 50 Hz is applied to their combination, then the impedance of the circuit will be

A circuit consists of a resistance 10 ohm and a capacitance of 0.1 mu F If an alternating e.m.f. of 100 V. 50 Hz is applied, calculate the current in the circuit.

MTG GUIDE-ELECTROMAGNETIC INDUCTION AND ALTERNATING CURRENTS-NEET CAFE TOPICWISE PRATICE QUESTIONS (WATTLESS CURRENT)
  1. A coil has an inductance of 0.7 H and is joined in series with a resis...

    Text Solution

    |