Two initially neutral conducting blocks 1 and 2 are on insulating stands and are

Question

Two initially neutral conducting blocks 1 and 2 are on insulating stands and are initially in contact. You then perform the following 3-step experiment. You bring a negatively charged rod near Block 1. While the rod is near Block 1, you touch Block 2. You take away the rod, and separate the blocks without touching them. After step 3, what are the charges on the blocks if any? Block 1 is positively charged, and Block 2 is neutral. Both blocks are neutral. Block 1 is positively charged, and Block 2 is negatively charged. Both blocks are positively charged. Block 1 is neutral, and Blocks 2 is negatively charged. A single point charge q is placed at the center of an imaginary cube that has 0.20-m-long edges, and a second point charge Q (Q=-2q) is outside the cube. The total electric flux out of the cube is Phi=3500 Nm^2/C. How much charge is at the center of the cube? 1.2 times 10^-9 C 1.0 times 10^-8 C 2.1 times 10^-8 C 3.1 times 10^-8 C 7.7 times 10^-7 C

Explanation / Answer

13) The Law of Conservation of Charge. The net charge of an isolated system remains constant. The only way to change the net chargeof a system is to bring in charge from elsewhere, or remove chargefrom the system. Charge can be created and destroyed, but only in positive-negative pairs. So option C, block 1is positively charged and block 2 is negatively charged.

14) The total flux through all the sides =q/, where is the permittivity of free space.

The flux through each side= /6
These values of flux do not depend on the size of the cube.

Note: = 8.85x 10^-12 C^2/ Nm^2

So, q= 1.2 * 10^-9 C

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