Physics Circle home Student Login

Home›Chapters›Electromagnetic Induction PYQs›Magnetic Flux & Faraday's Law›Question 73

NEET 2019 · Magnetic Flux & Faraday's Law

Magnetic Flux & Faraday's Law question from NEET 2019

Q73NEET 2019Medium

Magnetic Flux & Faraday's Law

A 800 turn coil of effective area 0.05 m2 is kept perpendicular to a magnetic field 5 × 10–5 T. When the plane of the coil is rotated by 90° around any of its coplanar axis in 0.1 s, the emf induced in the coil will be:

Show answer and solution

Answer: (b)

  1. Rotating by 90∘90^\circ: flux goes from NBANBA to 00, so Δϕ=NBA\Delta\phi = NBA.
  2. NBA=800×5×10−5×0.05=2×10−3NBA = 800 \times 5 \times 10^{-5} \times 0.05 = 2 \times 10^{-3} Wb
  3. e=2×10−30.1=0.02e = \frac{2 \times 10^{-3}}{0.1} = 0.02 V
  4. So the answer is (b) 0.02 V.
Report a mistake

More questions on Magnetic Flux & Faraday's Law