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Unformatted text preview: LAST NAME: STUDENT NR: PHYS 1010 6.0: CLASS TEST 6 Time: 50 minutes; Calculators & formulae provided at the end = only aid; Total = 20 points. 1) A current loop with a resistance R = 250 Ω and an area A = 0 . 4 m 2 is oriented perpendicular to a magnetic field that varies in time according to B ( t ) = 0 . 5 t (1 t ) ( t and B are in SI units). What is the current induced in the loop at t = 0 s, at t = 0 . 5 s, and at t = 1 s? 1 2) A circular loop of wire lies in the x y plane so that the axis of the loop lies along z . A homogeneous (spatially uniform) magnetic field B ( t ) is antiparallel to the zaxis. ( B z ( t ) < 0, B x = B y = 0). If B ( t ) is decreasing with time, what is the direction of the induced current when viewed from above? Start with a drawing, and explain your steps and reasoning! 3) Two inductors L 1 and L 2 are connected in series to form an equivalent inductor L eq . Together they are connected to a battery of voltage Δ V B via a switch. Draw a circuit diagram depicting the situation. Formulate Kirchhoff’s loop law for the circuit. Derive how L eq depends on L 1 and L 2 . 2 ... 4a) Consider a simple LC circuit (L and C in parallel) with values C = 1500 pF and L = 20 mH. At t = 0 the current is I = 45 mA and the charge on C is zero. Calculate the= 45 mA and the charge on C is zero....
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This note was uploaded on 06/14/2010 for the course PHYS 1410 taught by Professor Wijngaarden during the Spring '09 term at York University.
 Spring '09
 WIJNGAARDEN
 Physics, Current, Resistance

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