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Unformatted text preview: 4B Homework 10 *Question 1 A small loop of area A = 4.1 mm 2 is inside a long solenoid that has n = 701 turns/cm and carries a sinusoidally varying current i of amplitude 3.35 A and angular frequency 255 rad/s. The central axis of the loop and solenoid coincide. What is in millivolts the amplitude of the emf induced in the loop? Number 0.31 Units mV The number of significant digits is set to 2; the tolerance is +/-2% *Question 2 In the figure 30-48, a stiff wire bent into a semicircle of radius a = 5.8 cm is rotated at constant angular speed 68 rev/s in a uniform 27 mT magnetic field. What are the (a) frequency and (b) the amplitude of the emf induced in volts in the loop? Figure 30-48 (a) Number 68.0 Units Hz (b) Number 0.061 Units V Answer a1: the number of significant digits is set to 3; the tolerance is +/-2% Answer b1: the number of significant digits is set to 2; the tolerance is +/-2% *Question 3 One hundred turns of (insulated) copper wire are wrapped around a wooden cylindrical core of cross-sectional area 1.92 x 10-3 m 2 . The two ends of the wire are connected to a resistor. The total resistance in the circuit is 12.0 . If an externally applied uniform longitudinal magnetic field in the core changes from 2.25 T in one direction to 2.25 T in the opposite direction, how much charge (in C) flows through a point in the circuit during the change?changes from 2....
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- Spring '09
- Magnetic Field