A circular disc of radius 0.2 m is placed

Asked by admin @ 23/08/2021 in Physics viewed by 310 People

18. A circular disc of radius 0.2 m is placed in a uniform magnetic field of induction =

1/π Wb/m2 in such a waythat its axis makes an angle of 60° with B. Themagnetic flux linked with the disc is[AIPMT (Prelims)-2008)(1) 0.01 Wb(2) 0.02 Wb(3) 0.06 Wb(4) 0.08 Wb

Answered by admin @ 23/08/2021

Answer : Φ = 0.02 Wb

Explanation:

Given :

Magnetic induction = B = 1/π Wb/m^2

Radius of disc = r = 0.2 m

Area of disc = ds = πr^2 = π*(0.2)^2

ds = 0.04π m^2

We have,

Magnetic flux(Φ) = Bdscos(theta)

=> Φ = 1/π * 0.04π * cos(60°)

=> Φ = 0.04 * 1/2

=> Φ = 0.02 Wb

Thus the magnetic flux (Φ) = 0.02 Wb

Option (2) 0.02 Wb is correct

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