# hw10 - homework 10 LIN KEVIN Due 4:00 am Question 1 chap 31...

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homework 10 – LIN, KEVIN – Due: Mar 31 2008, 4:00 am 1 Question 1, chap 31, sect 4. part 1 of 1 10 points A long solenoid has a coil made of Fne wire inside it and coaxial with it. I Outside solenoid has n turns per meter Inside coil has N turns r R Given a varying current I in the outer solenoid, what is the emf induced in the inner loop? 1. E = π r 2 μ 0 n d I dt 2. E = π r μ 0 n d I dt 3. E = π R 2 μ 0 n d I dt 4. E = π r μ 0 N d I dt 5. E = π R μ 0 N d I dt 6. E = π R μ 0 n N d I dt 7. E = π R μ 0 n d I dt 8. E = π r μ 0 n N d I dt 9. E = π R 2 μ 0 n N d I dt 10. E = π r 2 μ 0 n N d I dt Question 2, chap 31, sect 2. part 1 of 1 10 points A coil with N 1 = 17 . 9 turns and radius r 1 = 15 . 5 cm surrounds a long solenoid of radius r 2 = 1 . 19 cm and N 2 2 = n 2 = 1900 m 1 (see the Fgure below). The current in the solenoid changes as I = I 0 sin( ω t ), where I 0 = 5 A and ω = 120 rad / s. R a b E 2 1 Outside solenoid has N 1 turns Inside solenoid has N 2 turns A 1 A 2 What is the magnitude of the induced emf , E AB , across the 17 . 9 turn coil at t = 1000 s? Answer in units of V. Question 3, chap 31, sect 6. part 1 of 3 10 points An inductor and a resistor are connected with a double pole switch to a battery as shown in the Fgure. The switch has been in position b for a long period of time. 176 mH 5 . 78 Ω 7 . 6 V S b a If the switch is thrown from position b to position a (connecting the battery), how much time elapses before the current reaches 195 mA? Answer in units of ms. Question 4, chap 31, sect 6. part 2 of 3 10 points What is the maximum current in the induc- tor a long time after the switch is in position a ? Answer in units of A.

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homework 10 – LIN, KEVIN – Due: Mar 31 2008, 4:00 am 2 Question 5, chap 31, sect 6.
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hw10 - homework 10 LIN KEVIN Due 4:00 am Question 1 chap 31...

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