Home
Class 12
PHYSICS
In series with 20 ohm resitor a 5 henry ...

In series with `20 ohm` resitor a `5` henry inductor is placed. To the combination an e.m.f. of `5` volt is applied. What will be the rate of increase of current at `t=0.25 sec`?

A

`e`

B

`e^(-2)`

C

`e^(-1)`

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
C
`i=i_(0)(1e^(-Rt//L))implies(di)/(dt)=i_(0)((R )/(L))e^(-Rt//L)=(E)/(L)e^(-Rt//L)`
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • ELECTROMAGNETIC INDUCTION

    A2Z|Exercise Applications Of Emi|58 Videos

  • ELECTROMAGNETIC INDUCTION

    A2Z|Exercise Problems On Mixed Concepts|37 Videos

  • ELECTROMAGNETIC INDUCTION

    A2Z|Exercise Motional And Rotational Emf|95 Videos

  • ELECTRIC POTENTIAL & CAPACITANCE

    A2Z|Exercise Section D - Chapter End Test|29 Videos

  • ELECTROMAGNETIC WAVES AND COMMUNICATION SYSTEM

    A2Z|Exercise Section D - Chapter End Test|30 Videos

Similar Questions

Explore conceptually related problems

A3 H inductor is placed in series with 10 Omega resistor and an emf of 10V is applied to the combination. Find (i) the current at 0.3s, (ii) the rate of increase of current at 0.3s, (iii) the rate at which energy is dissipated as heat at t = 0.3s . (iv) the rate at which energy is stored in the magnetic field at 0.3s. (v) the rate at which energy is delivered by the battery, and (vi) the energy stored when the current has attained steady value.

A 20 H inductor is placed in series with 10 W resistor and an emf of 100 V is suddenly applied to the combination. At t = 1 s from t = 1 s from the start, find the rate at which energy is being stored in the magnetic field around the inductor (givne e^(-0.5)=0.61 ).

Knowledge Check

  • An inductor of 5 henry and a resistance of 20 ohm are connected in series with a battery of 5 volt. The initial rate of change of current is

    A
    `1 A s^(-1)`
    B
    `2.0 A s^(-1)`
    C
    `2.5 A s^(-1)`
    D
    `0.25 A s^(-1)`

  • An inductor of 2 henry and a resistance of 10 ohms are connected in series with a battery of 5 volts. The initial rate of change of current is

    A
    `0.5 amp//sec`
    B
    `2.0 amp//sec`
    C
    `2.5 amp//sec`
    D
    `0.25 amp//sec`

  • An inductor of 20 H and a resistance of 10 Omega , are connected to battery of 5 volt in series, then initial rate of change of current is :-

    A
    `0.5 amp//s`
    B
    `2.0 amp//s`
    C
    `2.5 amp//s`
    D
    `0.25 amp//s`

    • Similar Questions

    Explore conceptually related problems

    A 5H inductor is placed in series with a 10Omega resistor. An emf of 5V being suddenly applied to the combination. Using these values prove the principle of conservation of energy, for time equal to the time constant.

    A 50 mH inductor is in series with a 10 Ohm resistor and a battery with an emf of 25 V. At t = 0 the switch is closed. Find Q: How long it takes the current to rise to 90% of its final value?

    The series combination of resistance R and inductance L is connected to an alternating source of e.m.f. e = 311 sin (100 pit) . If the value of wattless current is 0.5A and the impedance of the circuit is 311Omega , the power factor will be –

    A 12 ohm resistor and a 0.21 henry inductor are connected in series to an AC source operating at 20volts, 50 cycle/second. The phase angle between the current and the source voltage is

    A 50 volt potential difference is suddenly applied to a coil with L=5xx10^(-3) henry and R=180 ohm . The rate of increase of current after 0.001 second is

    Home
    Profile