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Question The light bulbs in the two diagrams are all identical. I the battery in figure A has an emf of 10.0 V, what should be the emf of the battery in figure B so that A the total brightness or power of the light bulbs in figure B is the same as the total brightness or power of the bulbs in figur ... Read More
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Question A 12 V battery is connected to a capacitor with 2.0 cm x 2.0 cm parallel plates, separated by a 0.1 mm air gap. While the capacitor is connected to the circuit, the space between the plates is filled with a dielectric slab with dielectric constant 4.5. How much does the charge on the posit ... Read More
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Question All capacitors are 18 μ in the figure. What is the equivalent capacitance between points A and B? ... Read More
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Question In the figure the capacitances are in micro-farads (μ). The equivalent capacitance of the network of capacitors is: ... Read More
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Question In the figure the capacitances are in micro-farads (μ), the charge on the positive plate of the top 6 μ capacitor is ... Read More
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Question A parallel plate capacitor has a plate area of 45 cm2 a plate separation of 30 micrometres and is filled with a dielectric material having a dielectric constant o 280. When charged to 6.0 V the potential energy stored in the device is? ... Read More
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Question A particular wire has a circular cross-section. for the first 1/2 meter of its one meter length its radius is 4 mm while or the second half it is 2 mm. 14 Coulombs of charge pass a point in the 4 mm section in 30 seconds. The current in the 2 mm section is ... Read More
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Question A copper wire has a length L, a square cross-section of side length W and an end to end resistance R. Without loss of material the wire is sliced along its long direction to make 4 equal length wires of Equal Square cross-sections (see figure). These are then welded together end-to-end to ... Read More
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Question A 24.0V DC motor raises a 1.00 kg mass with a constant speed through 10.0 meters in 20.0 seconds. Assuming no other energy losses the current drawn by the motor must be: ... Read More
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Question Three resistors A, B, and C are connected in parallel with a 12 V power supply. You feel each resistor in turn and B is hottest while C is coolest. The resistance values of the three resistors must be such that ... Read More
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Question The resistor network in the diagram has 12V across its end terminals labelled A and B. The current through, and voltage drop across, the 2k resistor are, respectively: ... Read More
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Question The figure shows 3 identical light bulbs wired as shown. With all bulbs lit the power supply (potential deference V ) sources current I. One of the parallel pair of light bulbs is unscrewed. Ignoring temperature dependent changes of the filament resistivity, the new current sourced by the ... Read More
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