1) A thin 1 m long copper rod in a uniform magnetic field has amass of 50 g. Whe
ID: 1679778 • Letter: 1
Question
1) A thin 1 m long copper rod in a uniform magnetic field has amass of 50 g. When the rod carries a current of .245 A, it floatsin the magnetic field. What is the field strength of the magneticfield?2) A rectangular coil .055m by .085 m is positioned so thatits cross-sectional area is perpendicular to the direction of amagnetic field, B. If the coil has 75 turns and a total resistanceof 8.7 and the field decreases at a rate of 3 T/s, whatis the magnitude of the induced current in the coil?
2) A rectangular coil .055m by .085 m is positioned so thatits cross-sectional area is perpendicular to the direction of amagnetic field, B. If the coil has 75 turns and a total resistanceof 8.7 and the field decreases at a rate of 3 T/s, whatis the magnitude of the induced current in the coil?
Explanation / Answer
2) A rectangular coil .055m by .085 m is positioned so that itscross-sectional area is perpendicular to the direction of amagnetic field, B. If the coil has 75 turns and a total resistanceof 8.7 and the field decreases at a rate of 3 T/s, whatis the magnitude of the induced current in the coil? Area of the coil = A = 0.055 * 0.085 =0.00467m2 N = 75 turns R = 8.7 dB/dt = 3 T/s We know that induced emf = - NAdB/dt ==> i = (NA/R) * dB/dt = (75 * 0.00467 / 8.7 ) * 3 = 0.1209 A
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