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A small circular coil of 20 turns of wire lies in a uniform field of 0.5 T, so that the normal to the plane of the coil makes an angle of 60 degrees with the direction B (magnetic field with arrow over top). The radius of the coil is 4 cm, and it carries a current of 3 A.
(a) what is the magnitude of the magnetic moment of the coil?
(b) what is the magnitude of the torque exerted on the coil?
An electric current of 1 A flows through a 20 ? resistor which is kept at a constant temperature of 10° C by flowing water. In 1 s what is the entropy change of the resistor and the entropy change of the water?
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An electron traveling at 114 m/s enters a1.9 T magnetic field. Determine what is the radius of the resulting circular path
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