Practice Exam 2_A - 1. A parallel-plate capacitor is...

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1. A parallel-plate capacitor is charged with a battery that is then disconnected. If the plate separation of this charged capacitor is doubled: A) the surface charge density on each plate is doubled B) the electric field is doubled C) the potential difference is halved D) the capacitance is doubled E) none of the above 2. A battery has an emf of 9V and an internal resistance of 2 . If the terminal potential difference is greater than 9V: A) it must be connected across a small external resistance B) the current must be zero C) it must be connected across a large external resistance D) the current must be out of the positive terminal E) the current must be out of the negative terminal 3. The current density is the same in two wires. Wire A has twice the free electron concentration (density) of wire B. The drift speed of electrons in A is: A) the same as that of electrons in B B) half that of electrons in B C) twice that of electrons in B D) four times that of electrons in B E) one-fourth that of electrons in B 4. A hexagonal loop of wire carrying a counter clockwise current of 2.0 A has 6 sides that are all 0.5 m long. . A 0.7 T uniform magnetic field is parallel to the base. The net magnetic force on the 5 dashed sides has a magnitude of: B I A) 0.30 N B) 0.51 N C) 0.41 N D) 0.21 N E) 0 Page 1
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5. A triangular solid in the shape of a 10 m wide inclined plane has height 3 m, length 4m and ramp length 5 m. A uniform, horizontal magnetic field B = 0.05 T is parallel to the 4m length. What is the magnetic flux through the ramp face, shaded in the figure? (use standard convention for normal vector direction of a closed surface) B 5m 4m 3m 10m deep A) -1.5 Tm 2 B) 0 C) 1.5 Tm 2 D) -2.5 Tm 2 E) 2.5 Tm 2 6. A parallel-plate capacitor, with air dielectric, is charged by a battery, after which the battery is disconnected. A slab of glass dielectric is then slowly inserted between the plates. As it is being inserted:
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Practice Exam 2_A - 1. A parallel-plate capacitor is...

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