Answer
given,
Power of sound P = 35 W
Distance between micro phone and speaker = 50 m
small microphone Area = 1 cm²
a) intensity of sound at micro phone is
I = 1.11 mW/m²
b) sound intensity level at the position of micro phone is
Answer:
B = 0.126 T
Explanation:
As per Faraday's law we know that rate of change in magnetic flux will induce EMF in the coil
So here we can say that EMF induced in the coil is given as
initially the coil area is perpendicular to the magnetic field
and after one fourth rotation of coil the area vector of coil will be turned by 90 degree
so we can say
now we will have