Its an electromagnetism question that i want the workings and answer to ...

Question: For an accelerating voltage of 900 V calculate the time taken for an electron to reach the anode after being accelerated from rest (u=0) at the cathode of a CRT. Anode-cathode separation is 1cm. I am looking for the working's out for this problem and the answer.

Electromagnetism question?

Question: A wire carrying a current of 100 A due west is suspended between two towers 50 metres apart. The lines of force of the Earth's magnetic field enter the ground there in a northerly direction at a 45 degree angle; the magnitude of the field is (5 mulitplied by 10`5 T). Find the magnitude and direction of the force on the wire exerted by the Earth's field. I would like the workings and answer to the following problem!

Static Magnetic Field - Flux

In the attachment titled "Box Question" are questions for the 2nd attachment, titled "The Box".

Static Magnetic Field Theory

The value of the angle on the attachment is 45 degrees, find the speed of the negatively charged particle if the flux, density of 0.8 Wb/m^2 and the particle has a charge of 4.8 x 10^ -15 C. The force exerted on the charged particle is 7.5 x 10^ -12 N. (See attached file for full problem description)

Static Magnetic Field Theory

Q 1) What is the flux density of the current loop in the plane of the loop on the attachment? 1) 1.68 x 10^ -5Wb/m^2 2) 2.36 x 10^ -5 Wb/m^2 3) 1.68 x 10^ -4 Wb/m^2 4) 2.36 x 10^ -4 wb/m^2 5) 2.87 x 10 wb/m^2 6) None of the above Q2) What is the value of the total flux threading the loop? 1) 5.92 x 10^ -8wb 2) 1.78 x 10^ -7 wb 3) 5.92 10^ -7 wb 4) 1.18 x 10^ -6 wb 5) None of the above. The only other info I have on Q1 is to Convert the cm to m, nothing more.