(Figure 1) shows two different situations where three forces of equal magnitude are exerted on a square board hanging on a wall, supported by a nail. Determine the sign of the total torque that the three forces exert on the board in case (a).
positive
negative
total torque is zero

Determine the sign of the total torque that the three forces exert on the board in case (b).
positive
negative
total torque is zero