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mcgill (mam8474) - HW 23-1 - Antoniewicz - (57050) This print-out should have 16 questions. Multiple-choice questions may continue on the next column...

can you help me with problems 3 thru 9
mcgill (mam8474) – HW 23-1 – Antoniewicz – (57050) 1 This print-out should have 16 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 (part 1 of 2) 5.0 points Given: B = b t , where b = 0 . 6 T / s (lower fgure). Consider a changing magnetic feld (From B to B , upper fgure) within a circle oF radius 2 m. The magnetic feld is pointing into the page and its magnitude is increasing. 2 m B B B 2 m B B B v t v B 0 B B ±ind the direction oF the induced emF E ind . 1. into the page 2. out oF the page 3. counter-clockwise 4. clockwise 002 (part 2 of 2) 5.0 points ±ind the magnitude oF the induced electric feld E ind on the perimeter oF the circular magnetic feld. Answer in units oF V / m 003 (part 1 of 7) 6.0 points In the fgure below oF coil oF wire with 250 turns is connected to a power supply, and a current runs in the coil. A single loop oF copper wire is in the x y plane, with its axis on the same line as the axis oF the coil. The loop and the coil are stationary. The radius oF the coil is 9 cm, and the radius oF the loop is 4 cm. The center oF the loop is 2 . 2 m From the center oF the coil. At time t 1 , the conventional current I in the coil is 5 A, and it is not changing. Remember that: μ 0 4 π = 1 × 10 7 N · m / A Power Supply + y x z Loop b P Coil I What is the absolute value oF the magnetic ²ux through the loop at time t 1 ? Answer in units oF T · m 2 004 (part 2 of 7) 3.0 points What is the direction oF the electric feld at location P in the copper wire oF the loop at time t 1 ? (Remember that at this time the current in the coil is constant.) 1. a 0 , 1 , 0 A 2. a 0 , 1 , 0 A 3. a 0 , 0 , 1 A 4. a 1 , 0 , 0 A 5. There is no electric feld inside the copper loop. 6. a− 1 , 0 , 0 A 7. a 0 , 0 , 1 A 005 (part 3 of 7) 3.0 points
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mcgill (mam8474) – HW 23-1 – Antoniewicz – (57050) 2 At a later time t 2 , the current in the coil begins to decrease. Now what is the direction of the electric Feld in the loop at point P? 1. a 0 , 0 , 1 A 2. a 0 , 0 , 1 A 3. a− 1 , 0 , 0 A 4. a 1 , 0 , 0 A 5. a 0 , 1 , 0 A 6. a 0 , 1 , 0 A 7. There is no electric Feld inside the copper loop. 006 (part 4 of 7) 6.0 points At time t 2 , the current in the coil is decreasing at a rate of 0 . 3 A / s. At this time, what is the absolute value of the rate of change of the magnetic ±ux through the loop? Answer in units of V 007 (part 5 of 7) 3.0 points At this time, what is the absolute value of the emf in the loop? Answer in units of V 008 (part 6 of 7) 6.0 points What is the magnitude of the electric Feld at location P , which is inside the wire? Answer in units of V / m 009 (part 7 of 7) 3.0 points Now the wire loop is removed. Everything else remains as it was at time t 2 ; the current is still changing at the same rate. What is the magnitude of the electric Feld at location P ? Answer in units of V / m 010 (part 1 of 2) 5.0 points In the Fgure below, the north pole of a bar magnet points toward a thin circular coil of wire containing 55 turns. The magnet is moved away from the coil, so that the ±ux through one turn inside the coil decreases by 0 . 4 T · m 2 in 0 . 2 s. S N vV What is the average emf in the coil during this time interval? Answer in units of V 011 (part 2 of 2) 5.0 points Viewed from the right side (opposite the bar magnet), does the induced current run clock- wise or counterclockwise? 1. Clockwise 2. There is no induced current. 3. Counterclockwise 4. Not enough information 012 (part 1 of 3) 7.0 points An electron under the in±uence of some central force moves at speed V i in a counter- clockwise circular orbit of radius R . A uni- form magnetic Feld B perpendicular to the plane of the orbit is turned on (see Fgure). B increasing V electron circular path of electron radius R Suppose that the magnitude of the Feld changes at a given rate d B dt . What is the magnitude of the electric Feld induced at the radius of the electron orbit?
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