You are watching: What is the magnitude of the torque on the current loop in the figure(figure 1)?
Motors are the most common application of magnetic pressure on current-carrying wires. Electric motors contain loops of wire in a magnetic field. When current is passed v the loops, the magnetic ar exerts speak on the loops, i beg your pardon rotates a shaft. Electrical energy is converted right into mechanical work-related in the process. Once the loop’s surface ar area is aligned through the magnetic field, the direction of present is reversed, so over there is a consistent torque ~ above the loop ((Figure)). This reversal the the current is done through commutators and also brushes. The commutator is collection to reverse the current flow at set points to keep continuous motion in the motor. A simple commutator has actually three contact locations to avoid and dead spots where the loop would have zero instantaneous torque at that point. The pen press versus the commutator, developing electrical contact in between parts the the commutator throughout the spinning motion.
A streamlined version the a dc electrical motor. (a) The rectangular wire loop is put in a magnetic field. The forces on the wires closest to the magnetic poles (N and also S) are opposite in direction as figured out by the right-hand rule-1. Therefore, the loop has a net torque and rotates to the position displayed in (b). (b) The brushes now touch the commutator segments so the no present flows with the loop. No torque acts on the loop, yet the loop proceeds to spin indigenous the initial velocity given to that in part (a). By the moment the loop flips over, current flows through the wires again yet now in the opposite direction, and the process repeats together in part (a). This causes continual rotation of the loop.
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