Assignment:
Question 1. A compass needle in a uniform magnetic field of 0.30 T experiences a torque of 0.050 N * m when it points in a direction 45 degrees away from the direction of the field. What is the magnitude of the needle's magnetic moment?
Question 2. A slender, 150-g bar magnet 15.0 cm long has a magnetic moment of 5.30 x 10^6 A * m^2. It is held at an angle of 45 degrees to the direction of a uniform magnetic field. When released, it begins to rotate about its center with an intial angular acceleration of 5.09 x 10^-3 rad/s^2. What is the magnitude of the magnetic field.
Question 3. A wire 0.250 m long carries a current of 0.750 A in a region of uniform magnetic field. The wire is subject to a force of 2.50N when held perpendicular to the direction of the field. What is the magnitude of the magnetic field?
Question 4. Alpha particles from a particular radioactive source have a speed of 1.85 x 10^7 m/s. How large a magnetic field is required to bend the path of the particles into a circle of 0.580-m radius? An alpha particle has a mass of 6.64 x 10^-27 kg and a charge of 3.20 x 10^-19 C.
Question 5. A long straight wire carries a current of 100mA. What is the magnitude of the magnetic field 10.0cm from the wire?
Question 6. Two parallel wires spaced a distance d apart experience an attractive fore per unit length of 6.00 x 10^-4 N/m. If the currents have a magnitude of 10.0A each, what is the distance d?
Question 7. A coil of 32 turns of wire is wound about a circular form. The average diameter of the individual loops is 28.5 cm. Calculate the magnetic moment of the coil when it carries a current of 1.75A.
Question 8. A lab technician needs to make an ammeter that measures 15 A full scale. The only galvanometer available deflects full scale as a current of 100 microA, and its resistance is 10kOhm. What resistance is needed and how should it be connected to the galvanometer?
Question 9. A student needs to make a voltmeter that measures 200V full scale. The only galvanometer available deflects full scale at a current of 10.0 mA, and its resistance is 1.00 kOhm. (a) What resistance is needed and how should it be connected to the galvanometer? (b) Draw a circuit diagram for the resulting meter.