Home
Class 12
PHYSICS
A coil of inductance 8.4 mH and resistan...

A coil of inductance 8.4 mH and resistance `6 (Omega)` is connected to a 12 V battery. The current in the coil is 1.0 A at approximately the time

A

`500 s`

B

`25 s`

C

`35 ms`

D

`1 ms`

Text Solution

Verified by Experts

The correct Answer is:
D
We have
`I = I_(0)(I - e^(-t//tau))` ltbr gt But `I_(0) = (V)/(R )` and `tau = (L)/(R )`
`:. I = (V)/(R ) (1 -e^(-Rt//L)) = (12)/(6)[1- e^(6t//8.4xx 10^(-3))]`
`= 1` (given)
`:. T = 0.97 xx 10^(-3) s = 1 ms`
Promotional Banner

Topper's Solved these Questions

  • INDUCTANCE

    CENGAGE PHYSICS|Exercise Archives (multiple Correct)|3 Videos

  • INDUCTANCE

    CENGAGE PHYSICS|Exercise Archives (linked Compreshension)|8 Videos

  • INDUCTANCE

    CENGAGE PHYSICS|Exercise Archives (fills In The Blanks)|3 Videos

  • HEATING EFFECT OF CURRENT

    CENGAGE PHYSICS|Exercise Thermal Power in Resistance Connected in Circuit|28 Videos

  • KINETIC THEORY

    CENGAGE PHYSICS|Exercise Question Bank|31 Videos

Similar Questions

Explore conceptually related problems

A coil o finductanc e 8.4mH and resistance 6Omega is connected to a 12V battery. The current in the coil is 1.0A in the time (approx .)

A coil of inductance 0.50H and resistanace 100 Omega is connected to a 240V, 50Hz ac supply. What are the maximum current in the coil and the time lag between boltage maximum and current maximum?

A coil of inductance 0.2 H and 1.0 W resistance is connected to a 90 V source. At what rate will the current in the coil grow at the instant the coil is connected to the source?

A coil of inductance 8.4xx10^(-3) H and a resistance of 6 Omega are connected to a 12 V battery as shown in the figure . Switch is closed at t=0 . At what time is the magnetic energy in the coil 4.2xx10^(-3) Joule ?