Please solve the following 3 questions and please show all work and formulas used, thank you.

In the figure, initially unpolarized light is sent into a system of three polarizing sheets whose polarizing directions make angles of 91 = 53, 92 = 21, and B3 = 35 with the direction of the y axis. What percentage of the light's initial intensity is transmitted by the system? Two long straight wires are parallel and 6.5 cm apart. They are to carry equal currents such that the magnetic eld at a point halfway between them has magnitude 400 |.IT. (a) Should the currents be in the same or opposite directions? (b) How much current is needed? The figure shows wire 1 in cross section; the wire is long and straight, carries a current of 4.25 mA out of the page, and is at distance d1 = 2.44 cm from a surface. Wire 2r which is parallel to wire 1 and also long, is at horizontal distance d; = 5.25 cm from wire 1 and carries a current of 6.94 mA into the page. What is the x component of the magnetic force per unit length on wire 2 due to wire 1