Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NTA Abhyas 2020
Exam
NTA Abhyas
Year
2020
Subject
Physics
Chapter
Electromagnetic Induction

NTA Abhyas 2020 · Physics · Electromagnetic Induction

A solenoid has 2000 turns wound over a length of 0.30 m . The area...

A solenoid has 2000\text{2000} turns wound over a length of 0.30 m\text{0}\text{.30 m}. The area of its cross section is 1.2×10−3m21.2 \times {10}^{- 3}m^{2}. Around its central section, a coil of 300\text{300} turns is wound. If an initial current of 2 A\text{2 A} in the solenoid is reversed in 0.25 s\text{0}\text{.25 s}, then the emf induced in the coil is equal to

Options

  1. A8.6×10−28.6 × {10}^{- 2} V
  2. B4.8×10−24.8 \times {10}^{- 2} V
  3. C1.2×10−21.2 × {10}^{- 2} V
  4. D6.0×10−26.0 × {10}^{- 2} V

Correct answer

B. 4.8×10−24.8 \times {10}^{- 2} V

Step-by-step solution

Emf = \dfrac{Mdi}{dt} = \left(\dfrac{{μ}_{0} {N}_{1} {N}_{2} A}{l}\right)\dfrac{di}{dt}<br/><br />= \dfrac{4\pi \times {10}^{- 7} \times 2000 \times 300 \times 1.2 \times {10}^{- 3}\left(4\right)}{0.3 \times 0.25}<br/><br/><br /><br />= 4.8 \times {10}^{- 2} V
Practice Electromagnetic Induction on Quantrex Academy →

More from Electromagnetic Induction

List-I contains four conducting loops lying in the XY plane, as shown in the figures. The… JEE Advanced 2026A 30 cm long solenoid has 10 turns per cm and area of 5 cm ^2 . The current through the… JEE Main 2026A square loop of side 2 cm is placed in a time varying magnetic field with magnitude as B… JEE Main 2026An inductor of inductance 10 mH having resistance of 100\,Ω is connected to battery of… JEE Main 2026A metal rod of length L rotates about one end at origin with a uniform angular velocity ω… JEE Main 2026A circular loop of radius 20 cm and resistance 2\ Ω is placed in a time varying magnetic… JEE Main 2026In the given circuit below inductance values of L_1 , L_2 and L_3 are same. The magnetic… JEE Main 2026A circular current loop of radius R is placed inside square loop of side length L (L >>… JEE Main 2026 Full Electromagnetic Induction list All NTA Abhyas JEE Main PYQs