Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
BITSAT 2010
Exam
BITSAT
Year
2010
Subject
Physics
Chapter
Electromagnetic Induction

BITSAT 2010 · Physics · Electromagnetic Induction

The back emf induced in a coil, when current changes from 1 ampere...

The back emf induced in a coil, when current changes from 1 ampere to zero in one milli-second, is 4 volts, the self inductance of the coil is

Options

  1. A1 henry
  2. B4 henry
  3. C10−310^{-3} henry
  4. D4×10−34 \times 10^{-3} henry

Correct answer

D. 4×10−34 \times 10^{-3} henry

Step-by-step solution

e=−Ldidt\mathrm{e}=-\mathrm{L} \frac{\mathrm{di}}{\mathrm{dt}} But e=4V\mathrm{e}=4 \mathrm{ V} and didt=0−110−3=−1/10−3∴−110−3(−L)=4⇒L=4×10−3\frac{\mathrm{di}}{\mathrm{dt}}=\frac{0-1}{10^{-3}}=-1 / 10^{-3}\therefore \frac{-1}{10^{-3}}(-\mathrm{L})=4 \Rightarrow \mathrm{L}=4 \times 10^{-3} henry
Practice Electromagnetic Induction on Quantrex Academy →

More from Electromagnetic Induction

Inside a solenoid of radius 0.5 m , magnetic field is changing at a rate of 50 × 10^ -6 T… BITSAT 2024There are two long co-axial solenoids of same length l . The inner and outer coils have… BITSAT 2024A rectangular loop of length 2.5 m and width 2 m is placed at 60^ ^ ∘ to a magnetic field… BITSAT 2024A 12 V battery connected to a coil of resistance 6 Ω through a switch, drives a constant… BITSAT 2023In an LC oscillator, if values of inductance and capacitance become twice and eight… BITSAT 2023A conducting loop of radius 10 π cm is placed perpendicular to a uniform magnetic field… BITSAT 2023A metal disc of radius 100 cm is rotated at a constant angular speed of 60 rad / s in a… BITSAT 2021A conducting square loop of side L and resistance R moves in its plane with a uniform… BITSAT 2020 Full Electromagnetic Induction list All BITSAT PYQs