4. 1 points SerPSE9 31.P.008.I My Notes Ask Your Teacher A strong electromagnet

Question

4. 1 points SerPSE9 31.P.008.I My Notes Ask Your Teacher A strong electromagnet produces a uniform magnetic field of 1.60 T over a cross-sectional area of 0.310 m2. A coil having 190 turns and a total resistance of 17.0 current in the electromagnet is then smoothly reduced until it reaches zero in 20.0 ms. What is the current induced in the coil? is placed around the electromagnet. The Need Help? Resad Wach 5. -3 points SerPSE9 31.P.011.M My Notes Ask Your Teacher An aluminum ring of radius r1-5.00 cm and a resistance of 3.45 x 10-4 ? ls placed around one end of a long air-core solenold with 960 tums per meter and radius r2-3.00 cm as shown in the figure below. Assume the axial component of the field produced by the solenoid is one-half as strong over the area of the end of the solenoid as at the center of the solenoid. Also assume the solenoid produces negligible field outside its cross-sectional area. The current in the solenold is increasing at a rate of 270 Vs. (a) What is the induced current in the ring? (b) At the center of the ring, what is the magnitude of the magnetic field produced by the induced current in the ring? HT (c) At the center of the ring, what is the direction of the magnetic field produced by the induced current in the ring? to the left to the right upward Need Help?Read ItMaster It

Explanation / Answer

4. induced emf = rate of change of magnetic flux

= N A dB/dt

= (190)(0.310)(1.60 - 0) / (20 x 10^-3)

= 4712 Volt

I = e / R = 4712 / 17 = 277 A  

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