* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Tutorial 3 Magnetostatics
Geomagnetic storm wikipedia , lookup
Edward Sabine wikipedia , lookup
Maxwell's equations wikipedia , lookup
Mathematical descriptions of the electromagnetic field wikipedia , lookup
Van Allen radiation belt wikipedia , lookup
Magnetic stripe card wikipedia , lookup
Electromagnetism wikipedia , lookup
Electromotive force wikipedia , lookup
Friction-plate electromagnetic couplings wikipedia , lookup
Magnetometer wikipedia , lookup
Giant magnetoresistance wikipedia , lookup
Neutron magnetic moment wikipedia , lookup
Electromagnetic field wikipedia , lookup
Earth's magnetic field wikipedia , lookup
Magnetotactic bacteria wikipedia , lookup
Electrical resistance and conductance wikipedia , lookup
Magnetic monopole wikipedia , lookup
Superconducting magnet wikipedia , lookup
Multiferroics wikipedia , lookup
Magnetotellurics wikipedia , lookup
Magnetoreception wikipedia , lookup
Force between magnets wikipedia , lookup
Magnetohydrodynamics wikipedia , lookup
Ferromagnetism wikipedia , lookup
Magnetochemistry wikipedia , lookup
History of geomagnetism wikipedia , lookup
Lorentz force wikipedia , lookup
Electromagnet wikipedia , lookup
ECT1026 Field Theory MMU/FOE/ TRIM 1 2010/11 Tutorial 3 Magnetostatics – Part A Steady Current and Current Density Q1. Consider a circular, cylindrical, copper conductor of radius 1.025mm. If the wire carries a current of 0.2A dc, determine the current density in the wire and the voltage drop across 1m length. [Conductivity of copper wire = 5.8 × 10 7 S/m]. Ampere’s Law Q2. Current I flow along the positive z-direction in the inner conductor of a long coaxial cable and returns through the outer conductor. The radius of the inner conductor is a, and the inner and outer radii of the outer conductor are b and c respectively. (a) Determine the magnetic flux density in each of the following regions: r a, a r b, b r c. (b) Plot the magnitude of B as a function of r. Q3. A wire carrying a current of 4 A is formed into a circular loop. If the magnetic field at the center of the loop is 20 A/m, what is the radius of the loop has (a) only one turn (b) 20 turns? Magnetic Flux Density Q4. A charge 1.8 x 10-19 C is moving with a speed of 1 x 106 m/s through a magnetic field. The magnetic flux density with 3.5 T experiences a magnetic force of magnitude 2x10-13 N. Determine the angle between the magnetic field and proton’s velocity? Biot- Savart Law Q5. The metal niobium becomes a superconductor with the zero electrical resistance when it is cooled to below 9 K, but its superconductive behavior ceases when the magnetic flux density at its surface exceeds 0.12 T. Find the maximum current that a 0.1 mm diameter niobium wire can carry and remain superconductive. Magnetic Force Q6. A charged particle with velocity u is moving in a medium containing uniform fields E x E and B y B . What should u be so that the particle experiences no net force on it 1