Home
Class 12
PHYSICS
An inductor of self inductance 12 H carr...

An inductor of self inductance 12 H carries a steady current of 2A. How can a 60V self-induced e.m.f. be made to appear in the inductor?

Text Solution

Verified by Experts

`L=12H," "I=2A,varepsilon=60V` Let `(dI)/(dt)` be the rate of variation of current required,
so that, `(dI)/(dt)=(varepsilon)/(L)=(60)/(12)=5A//s" "therefore (dI)/(dt)xxt=2andt=(2)/((dI)/(dt))=(2)/(5)=0.4s`
The current should be uniformly reduced from 2 to zero in 0.4 seconds.
Promotional Banner

Topper's Solved these Questions

  • ELECTROMAGNETIC INDUCTION

    NEW JOYTHI PUBLICATION|Exercise SOLUTIONS TO EXERCISES FROM NCERT TEXT|14 Videos

  • ELECTROMAGNETIC INDUCTION

    NEW JOYTHI PUBLICATION|Exercise PRACTICE PROBLEMS FOR SELF ASSESSMENT|3 Videos

  • ELECTRIC CHARGES AND FIELDS

    NEW JOYTHI PUBLICATION|Exercise Competitive Exam Corner|20 Videos

  • ELECTROMAGNETIC WAVES

    NEW JOYTHI PUBLICATION|Exercise COMPETITIVE EXAM CORNER|16 Videos

Similar Questions

Explore conceptually related problems

An inductor of inductance L carries an electric current i. How much energy is stored while establishing the current in it ?

An inductor coil carries a steady state current of 2.0 A when connected across an ideal battery of emf 4.0 V. if its inductance is 1.0 H, find the time constant of the circuit.

An inductor coil joined to a 6 V battery draws a steady current of 12 A . This coil is connected to a capacitor and an AC source of rms voltage 6 V in series. If the current in the circuit is in phase with the emf, find the rms current.

The current flowing through an inductor of self inductance L is continuously increasing plot a graph showing the variation of induced emf versus (dI)/(dt)

The current flowing through an inductor of self inductance L is continuously increasing plot a graph showing the variation of magnetic potential energy stored varsus the current.

The current flowing in two coils of self inductance LI = 20mH and I2 = 15mH are increasing at the same rate. If the power supplied to the same rate. If the power supplied to the two coils are equal. Find the ratio of (i) induced emf (ii) induced current a given instant.

An inductor-coil of inductance 20 mH having resistance 10 Omega is joined to an ideal battery of emf 5.0 V. Find the rate of change of the induced emf at t=0, (b) t = 10 ms and (c ) t = 1.0s.

An inductor coil of resistance 10 Omega and inductance 120 mH is connected across a battery of emf 6 V and internal resistance 2 Omega . Find the charge which flows through the inductor in (a) 10 ms, (b) 20ms and (c ) 100ms after the connections are made.