Consider a rectangular loop or wire 6.0 cm by 8.0 cm in a uniform magnetic field of magnitude 1.3 t. the loop is rotated from a position of zero magnetic flux to a position of maximum flux in 21 ms. what is the average induced emf in the loop? (a) 0.1 v (b) 0.2 v (c) 0.3 v (d) 0.4 v (e) 0.5 v

option C

Explanation:

given,

a rectangular loop of wire = 6 cm × 8 cm

magnetic field = 1.3 T

loop rotated from zero flux to maximum in 21 ms

to calculate average induced emf :

area of loop = 0.06 × 0.08 = 4.8 × 10⁻³ m²

maximum magnetic flux Φ₂ = B × A

                                        =  1.3 × 4.8 × 10⁻³ = 6.24 × 10⁻³ Wb

Ф₁ =  0

time taken to change the position from   Ф₁ to Φ₂ is 21 ms

average indused emf =

                                    =

                                    =  0.297 = 0.3 V

hence, the correct answer is option C

at positions a, g kinetic energy is maximum.

at position d, potential energy is maximum.

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