Let Q denote charge, V denote potential difference, and U denote stored energy.

Question

Let Q denote charge, V denote potential difference, and U denote stored energy. Of these quantities, capacitors in series much have the same: (a) Q only (b) V only (c) U only (d) Q and U only An isolated metal sphere of radius R is charged with-Q. What is the electric field at the center of the metal sphere? (a) 1/4 pi epsilon_0 Q/R^2 (b) -1/4 pi epsilon_0 Q/R^2 (c) 0 (d) 1/4 pi epsilon_0 Q^2/R^2 Current is a measure of: (a) Resistance to the movement of a charge past a point (b) Force that moves a charge past a point (c) Amount of charge that moves past a point per unit time (d) Energy used to move a charge past a point A 10 ohm resistor has a constant current. If 1800 C of charge flow through it in 10 minutes what is the value of the current? (a) 3.0 A (b) 5.0 A (c) 15 A (d) 18 A A current of 0.5 A exists in a 120 ohm lamp. The applied potential difference is: (a) 15 V (b) 30 V (c) 60 V (d) 120 V In the diagram R_1 > R_3 > R_2. Rank the three resistors according to the current in them, least to greatest: (a) 1, 2, 3 (b) 2, 3, 1 (c) 1, 3, 2 (d) All are the same Four wires meet at a junction. The first carries 4A out of the junction the second carries 6A into the junction, and the third carries 5A into the junction. The fourth carries: (a) 7A out of the junction (b) 7A into the junction (c) 3A out of the junction (d) 3A into the junction For the circuit shown in. what happens when the switch S is closed? (a) The capacitor charges up to a faction of the battery emf determined by R only (b) The capacitor eventually charges up to the full boom emf at a rate determined by R and C (c) The capacitor immediately charges up to the battery emf (d) The capacitor charges up to a fraction of the battery emf determined by R and C

Explanation / Answer

For the series combination of capacitors, the plates are always connected end to end. So the charge accumulated on the plates must be same.

Q is same.

For parallel combination the potential difference is same.

2) At the center of the metal sphere, the electric field is ero as electric field lines cannot penetrate through the conductor.

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