A point charge (m = 1.6g ) at the end of an insulating string of length 55 cm is observed to be in equilibrium in a uniform horizontal electric field of 9100N/C , when the pendulum's position is as shown in (Figure 1) , with the charge 12 cm above the lowest (vertical) position.
No title provided
1. Decide the sign of the point charge.
2. If the field points to the right in the figure, describe the magnitude of the point charge.