A2 PHYSICS HELP!! ocr m2u1Watch
1. Magnetic flux density is a vector. Use this idea to derive an equation fot the force acting on the wire in terms of the magnetic flux density, the current, the length of the wire in the field and the angle between the magnetic fields and the wire.
2. Show that the torque of the couple acting on a loop for a given and magnetic flux density is directly proportional to the area of the loop.
3. A proton of kinetic energy 15eV travelling at right-angles to a magnetic field describes a circle of radius 5.0cm. The mass of a proton is 1.7x10^-27kg.
a) Show that the speed of the proton is 1.7x10^6ms^-1.
b) For this proton, calculate the centripetal force provided by the magnetic field.
c) Determine the magnetic flux density of the magnetic field that keeps the proton moving in its circular orbit.
d) How long does it take for the proton to complete one orbit?
3. Show that T=(2xPixm)/(Be)