First slide

Charges

Question

Three metallic spheres say X, Y and Z have charges 10 C,-10 C, 10 C, respectively. X, Y and Z are brought in contact such that charge on both X and Y becomes 3 C. What is charge on Z ?

Easy

A

1 C
B

2 C
C

3 C
D

4 C

Solution

The net charge initially on X, Y and Z is
(10-10+10) = 10 C
Let final net charge on X, Y and Z is
q_x + q_y + q_z= 3+3+ $q_{z}$ = 10 C
Therefore, q_z= 4 C.

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