phy2049_f11_final_practice

# What is the magnitude of the induced magnetic field

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Unformatted text preview: a Gaussian surface in the form of a cube. The electric flux through any one face of the cube is: (1) q/16ε0 (2) q/4πε0 (3) q/4ε0 (4) q/ε0 (5) q/6ε0 PHY2049 Fall11 Final 12. A total charge of 7 × 10–8 C is uniformly distributed throughout a non-conducting sphere with a radius of 5 cm. The electric potential at the surface, relative to the potential far away, is about: (1) -1.3x104 V (2) 1.3x104 V (3) 7x105 V (4) -6.3x104 V (5) 0 13. Five cylindrical wires are made of the same material. Their lengths and radii are wire 1: length l , radius r wire 2: length 3l / 2, radius r/2 wire 3: length l / 2, radius r/2 wire 4: length l , radius r/2 wire 5: length 5l , radius r/2 Rank the wires according to their resistances, least to greatest. (1) 1, 3, 5, 2, 4 (2) 5, 4, 3, 2, 1 (3) 1 and 2 tie, then 5, 3, 4 (4) 1, 3, 4, 2, 5 (5) 1, 2, 4, 3, 5 14. The current in the 5.0-Ω resistor in the circuit shown is: (1) 0.42 A (2) 0.67 A (3) 1.5 A (4) 2.4 A (5) 3.0 A PHY2049 Fall11 Final 15. A rod with resistance R lies across frictionless conducting rails in a constant uniform magnetic field B, as shown. Assume the rails have negligible resistance. The magnitude of the force that must be applied by a person to pull the rod to the right at constant speed v is: (1) BLv/R (2) BLv (3) B2L2v/R (4) 0 (5) B...
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