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Chapter 30: Q80P (page 901)
In Fig. 30-63, ,and the ideal battery has. How long after switch S is closed is the current 2.0 mA?
For after switch S is closed, the value for the current is 2.0 mA
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As seen in Figure, a square loop of wire has sides of length 2.0 cm. A magnetic field is directed out of the page; its magnitude is given by , where B is in Tesla, t is in seconds, and y is in meters. At t = 2.5 s, (a) what is the magnitude of the emf induced in the loop? (b) what is the direction of the emf induced in the loop?
In Figure, a wire forms a closed circular loop, of radius R = 2.0mand resistance. The circle is centered on a long straight wire; at time t = 0, the current in the long straight wire is 5.0 Arightward. Thereafter, the current changes according to. (The straight wire is insulated; so there is no electrical contact between it and the wire of the loop.) What is the magnitude of the current induced in the loop at times t > 0?
A coil with an inductance of2.0 H and a resistance of is suddenly connected to an ideal battery with . At 0.10 safter the connection is made, (a) what is the rate at which energy is being stored in the magnetic field? (b) what is the rate at which thermal energy is appearing in the resistance? (c) what is the rate at which energy is being delivered by the battery?
A rectangular coil of N turns and of length a and width b is rotated at frequency f in a uniform magnetic field, as indicated in Figure. The coil is connected to co-rotating cylinders, against which metal brushes slide to make contact. (a) Show that the emf induced in the coil is given (as a function of time t) by. This is the principle of the commercial alternating-current generator. (b) What value of Nabgives an emf withwhen the loop is rotated at in a uniform magnetic field of 0.500 T?
One hundred turns of (insulated) copper wire are wrapped around a wooden cylindrical core of cross-sectional area . The two ends of the wire are connected to a resistor. The total resistance in the circuit is. If an externally applied uniform longitudinal magnetic field in the core changes from 1.60 Tin one direction to1.60 T in the opposite direction, how much charge flows through a point in the circuit during the change?
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