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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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