Question

8 A magnetic field of 2.0 T is directed perpendicular to the face of a circular coil with a radius of 25.0 om. what is the magnetic flux linked with the coil2 © A single urciar loop of wire with radius ab.Dem is perpendicular to a magnetic field which increases from 1,5T to 48T in 23.0ms, what is the induced e. m.f in the coll? 0 A square coil (20.0 cm x 20.0 cm) of wire consists of 50 loops. The Magnetic field is perpena iwlar to the face of the coil and increases from 3.0T to 5,0T In Ools. The Coil is connected across a 20. ohm resistor How much current fibws through the resistor? A coil of 100 turns and area 0.25m2 is in magnetic field of 1.5 X 16:4wb/m2. If the coil is teversed in time of 10.0ms, what is the induced emf in the coll? (2) A moving rod 45.0 cm jong spides to the right with a speed 06 2.0 mis in a magnetic field of 8,0T. What is the induced emit in the rod?

please help... Thanks in advance I appreciate your help

Answer 1

8]

Flux= Magnetic field*Area

Flux= 20[$\pi$(0.25)²]= 3.927$\approx$ 3.93 Wb

9]

e=Induced emf= Rate of change in flux

N=Number of turns

A=Area

B₁=Magnetic field intially

B₂=Magnetic field finally

t=Time interval

e= -NA(B₂-B₁)/t= -1*$\pi$(0.25)²*(4.8-1.5)/0.023= 28.17 V

10]

e= -NA(B₂-B₁)/t= 50*(0.2*0.2)(5-3)/0.1= 40V

I=Current= e/Resistance= 40/20= 20A

11]

e= -NA(B₂-B₁)/t= 100*0.25*(2*1.5*10^-4)/10*10^-3= 0.75 V

12]

Induced emf in moving rod= BVL

B=Magnetic field

V=Velocity of rod

L=Length of rod

e=BVL= 8*2*0.45= 7.2 V

In the above answers, we had calculated only the magnitude of induced emf