1. The current in a long, straight conductor has the following form: I(t) = lo coswt
What is the magnitude of the magnetic field a distance r away from the conductor? 2. Find the magnitude of the force on 20 m of wire carrying 150 A of current in a particle accelerator that has a magnetic field of 2.5 T that makes an angle of 90° with respect to the current flow. 3. What is the radius of curvature of an electron traveling at 2.5x107 m/s close to the core of the Milky Way galaxy, where the magnetic field has a strength of 35uG? Assume the angle between the field an the direction of travel is 65º. 4. What is the magnetic field due to an inductor of length 10 cm that has 300 turns if 0.25 A of current passes through it? What is its inductance is the cross sectional area of the inductor is 1.5 cm?? 5. What is the energy density inside of a 1 m long coil with 2000 turns that carries 25 A?