Homework Answers
The magnetic field at a height h from the table
B1 = uo I /2pi*(h + a)
where uo is the constant of permeability
I = Current , a = radius of the washer
h = height of the washer from the table
B1 = 4pi*10^-7*4.2 / 2pi*(1.2 + 0.0043)
= 6.975*10^-7 T
Magnetic field in the washer when it reaches the table
B2 = uo I /2pi*a = 4pi*10^-7*4.2 / 2pi*(0.0043) = 1.95*10^-4 T
Change in flux 
= A(B2 - B1)
= pi*(0.0043)^2 * ( 1.95*10^-4 - 6.975*10^-7)
= 1.13*10^-8 Wb
h = 0.5gt^2
t = sqrt(2h/g) = sqrt(2*1.2 / 9.8) = 0.494 s
emf induced =
/ t
= 1.13*10^-8 / 0.494 = 2.28*106-8 V
direction of induced current will be determined by lenz law which states that the current induced in a circuit due to a change in a magnetic field is directed to oppose the change in flux
so the direction of current will be in clockwise direction
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