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smith (nps467) - Webexam06 - sadoqi - (1620S12) This print-out should have 30 questions. Multiple-choice questions may continue on the next column or...

A 243-turn solenoid with a length of 21 cm
and radius of 0.9 cmcarries a current of 3 A. A
second coil of 4 turns is wrapped tightly about
this solenoid so that it can be considered to
have the same radius as the solenoid.
Find the change in the magnetic flux
through the coil when the current in the
solenoid increases to 8 A in a period of
1.11 s. The permeability of a vacuum is
4  × 10−7 T · m/A
Answer in units of T · m2
smith (nps467) – Webexam06 – sadoqi – (1620S12) 1 This print-out should have 30 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 10.0 points A rectangular loop consists oF 184 closely wrapped turns oF wire and has dimensions 0 . 4 m by 0 . 14 m. The loop is hinged along the y -axis, and its plane makes an angle oF 53 with the x -axis. A uniForm magnetic feld oF 0 . 96 T is di- rected along the x -axis and the current in the loop is 8 . 6 A in the direction shown. x y z 53 B = 0 . 96 T B = 0 . 96 T 0 . 4 m 0 . 14 m i = 8 . 6 A What is the magnitude oF the torque ex- erted about the hinge on the loop? Answer in units oF N · m 002 (part 1 of 2) 10.0 points The metal bar oF length l shown in the fgure is moving to the right along a pair oF Frictionless parallel metal rails at a constant speed v . The rails are connected at one end by a resistor with resistance R . A magnetic feld B points into the plane oF the paper. R B B I v a b c d What is the rate oF change oF the ±ux? 1. d Φ dt = B ℓ v 2 2. d Φ dt = 2 B ℓ v 3. d Φ dt = B v 4. d Φ dt = B ℓ v 5. d Φ dt = B ℓ 2 v 6. d Φ dt = B ℓ v 2 7. d Φ dt = B ℓ v 8. d Φ dt = B ℓ 2 v 2 9. d Φ dt = B ℓ 10. d Φ dt = B 2 ℓ v 003 (part 2 of 2) 10.0 points The direction oF the magnetic Force acting on the induced current in the rod is 1. upward slanted to the right. 2. upward slanted to the leFt. 3. coming out oF the page. 4. to the leFt. 5. upward From b to a . 6. downward slanted to the leFt. 7. to the right. 8. downward From a to b . 9. into the page. 10. downward slanted to the right. 004 10.0 points
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smith (nps467) – Webexam06 – sadoqi – (1620S12) 2 A singly charged positive ion has a mass of 3 . 31 × 10 26 kg. After being accelerated through a potential diFerence of 206 V the ion enters a magnetic ±eld of 0 . 789 T in a direction perpendicular to the ±eld. The charge on the ion is 1 . 602 × 10 19 C. ²ind the radius of the ion’s path in the ±eld. Answer in units of cm 005 (part 1 of 5) 10.0 points A series AC circuit contains a 229 Ω resistor, a 350 mH inductor, a 3 . 7 μ ² capacitor, and a generator with maximum voltage of 329 V operating at 50 Hz. Calculate the inductive reactance. Answer in units of Ω 006 (part 2 of 5) 10.0 points Calculate the capacitive resistance. Answer in units of kΩ 007 (part 3 of 5) 10.0 points Calculate the impedance. Answer in units of kΩ 008 (part 4 of 5) 10.0 points Calculate the maximum current. Answer in units of mA 009 (part 5 of 5) 10.0 points Calculate the phase angle. (Answer between - 180 and +180 .) Answer in units of 010 (part 1 of 2) 10.0 points Two in±nite wires 18 cm apart. The left-hand wire carries a current of 6 A into the paper. The right-hand wire carries a current of 6 A into the paper. The permeability of free space is 4 π × 10 7 N/A 2 . × × 18 cm 6 A 6 A What is the magnitude of the force between these two wires per unit length? Answer in units of N / m 011 (part 2 of 2) 10.0 points The force between the two wires 1. pulls both wires down. 2. pulls left wire down, pulls right wire up. 3. pulls left wire up, pulls right wire down. 4. pulls both wires to the right. 5. pulls both wires to the left. 6. pulls the wires together. 7. pulls both wires up. 8. only one of the force direction can be determined. 9. none of directions can be determined. 10. pulls the wires apart. 012 (part 1 of 2) 10.0 points A 243-turn solenoid with a length of 21 cm and radius of 0 . 9 cm carries a current of 3 A. A second coil of 4 turns is wrapped tightly about this solenoid so that it can be considered to have the same radius as the solenoid. ²ind the change in the magnetic ³ux through the coil when the current in the solenoid increases to 8 A in a period of 1 . 11 s. The permeability of a vacuum is 4 π × 10 7 T · m / A Answer in units of T · m 2 013 (part 2 of 2) 10.0 points ²ind the magnitude of the average induced emf in the coil. Answer in units of μ V 014 10.0 points An electron is in a uniform magnetic ±eld B that is directed into the plane of the page, as shown.
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