*NEEDS HELP WITH NUMBER 3* A coil has a resistance of 5 ohms and an inductance 0
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Question
*NEEDS HELP WITH NUMBER 3*A coil has a resistance of 5 ohms and an inductance 0.1H. At a particular instant in time after a battery is connected across the coil, the current is 2A , and is increasing at a rate of di/dot=20A/s Late assignments will not be accepted 1. A loop has a diameter of 11 cm. The magnetic field of a TV signal is normal to the plane of the loop and, at one instant of time, its magnitude is changing at the rate 0.16 T/s. The magnetic field is uniform. What emf is induced in the antenna? (1.52mv) 2. A metal rod is forced to move with constant velocity along two parallel metal rails, connected with a strip of metal at one end, as shown in the figure. A magnetic field B- 0.350 T points out of the page. (a) If the rails are separated by 25.0 cm and the speed of the rod is 55.0 cm/s, what emf is generated? (b) If the rod has a resistance of 18.0 0 and the rails and connector have negligible resistance, what is the current in the rod? (c) At what rate is energy being transferred to thermal energy?/05v,0.13mw) A coil has a resistance of5 ohms and an inductance 0.1H. At a particular instant in time after a battery is connected across the coil, the current is 2A, and is increasing at a rate of di/dt 20A/s.. 3. a) What is the voltage V of the battery? b) What is the time-constant of the circuit? c) What is the final value of the current? (12V,.02s,2.4A) Calculate the electrical energy is converted to light and thermal energy by a 200W light bulb in one day? If the same amount of energy in part a is stored in an inductor in which the current is 80A, what is the inductance? a) b)
Explanation / Answer
3) given that R = 5 ohm
and L = 0.1 H
I = 2 A
di/dt = 20 A/s
a) V = (iR) + L*(di/dt) = (2*5) + (0.1*20) = 12 V
b) time constant is T = L/R = 0.1/5 = 0.02 sec
c) final value of current is i = V/R = 12/5 = 2.4 A
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