torque (measured in Nm) is a rotational.. force? calculated using the formula:
T = Fd
where T = torque in Nm
F = force in N
d = distance in m
in particular situations where applying maximum force still doesnt cause any torque (rotation) the distance (radius) has to be increased eg. lengthening a spanner to twist bolts
in a motor.. this torque is produced in a coiled current-carrying conductor, because of the motor effect. however, if the current was going in the same direction in the wire, by the time it rotates 180*, the current would be going the other way in relation to the magnetic field, so it would turn the other way. in order for the coil to keep rotating, the current must be pushed in the other direction.
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