1. The magnitude and direction of the electric force on B, caused by A: 1.7954 x 10^-6 N, left
2. The magnitude and direction of the electric force on B, caused by C: 3.9844 x 10^-6 N, up
3. The magnitude of the net electric force on B: 2.1890 x 10^-6 N
4. The direction of the net electric force on B: Right
Electric Force on B due to A
The magnitude of the electric force on B due to A is 1.7954 x 10^-6 N. The direction of the electric force on B due to A is to the left, since pith ball A is positively charged and pith ball B is negatively charged.
Electric Force on B due to C
The magnitude of the electric force on B due to C is 3.9844 x 10^-6 N. The direction of the electric force on B due to C is upwards, since pith ball C is negatively charged and pith ball B is negatively charged
Net Electric Force on B
The magnitude of the net electric force on B is 2.1890 x 10^-6 N.
The direction of the net electric force on B?
The direction of the net electric force on B is to the right.