Qstnid -Iv-14-the North Pole Of A Magnet Is Brought Down Along The Axis Of A Horizontal Circular Coil (Figure). As A Result, The Flux Through The Coil Changes From 0.35 Weber To 0.85 Weber In An Interval Of Half A Second. Find The Average Emf Induced During This Period. Is The Induced Current Clockwise Or Anticlockwise As You Look Into The Coil From The Side Of The Magnet ? <Span Style="background-color: #Ffff00;">figure</span></span> - 38: Electromagnetic Induction - Neet-xii-physics

Loading…

NEET-XII-Physics

38: Electromagnetic Induction

with Solutions - page 5

Qstn# iv-14 Prvs-Qstn Next-Qstn

#14
The north pole of a magnet is brought down along the axis of a horizontal circular coil (figure). As a result, the flux through the coil changes from 0.35 weber to 0.85 weber in an interval of half a second. Find the average emf induced during this period. Is the induced current clockwise or anticlockwise as you look into the coil from the side of the magnet ?
Figure
Ans : Given:
Initial flux, ϕ₁ = 0.35 weber
Final flux ϕ₂ = 0.85 weber
∴ Δϕ = ϕ₂ - ϕ₁
= (0.85 - 0.35) weber
= 0.5 weber
Also,
Δt = 0.5 s
The magnitude of the induced emf is given by
`` e=\frac{∆\,\mathrm{\,\varphi \,}}{∆t}=\frac{0.5}{0.5}=1\,\mathrm{\,V\,}``

The induced current is anti-clockwise when seen from the side of the magnet.
Page No 307: