What is the position of the loop when the current is maximum?
What is the position of the loop when the current is maximum? The maximum current is when the loop is halfway into the region of the field. The maximum current is when the loop is at the beginning of the region of the field.
Which way will the current loop rotate?
The forces point toward the center of the loop and cancel each other. Both forces point upward perpendicular to and the piece of wire of length . Yes, the net torque acting on the loop is negative and tends to rotate the loop in the direction of decreasing angle (clockwise).
Why does the loop rotate?
In a uniform magnetic field, a wire loop carrying current experiences no net force, but there is generally a net torque acting that tends to make the loop rotate. The loop can rotate without friction about an axis parallel to its long sides, passing through the center of the loop.
Is the force between the wires attractive or repulsive?
Parallel wires carrying currents will exert forces on each other. One wire sets up a magnetic field that influences the other wire, and vice versa. When the current goes the same way in the two wires, the force is attractive. When the currents go opposite ways, the force is repulsive.
What is the direction of the net torque on the loop?
There is a horizontal uniform magnetic field pointing to the right. “The net force on any closed loop is zero.” Check simulations if in doubt. A square loop of wire is carrying current in the counterclockwise direction. There is a horizontal uniform magnetic field pointing to the right.
How do we calculate torque?
A practical way to calculate the magnitude of the torque is to first determine the lever arm and then multiply it times the applied force. The lever arm is the perpendicular distance from the axis of rotation to the line of action of the force. and the magnitude of the torque is τ = N m.
When an object is experiencing a net torque?
So, a net torque will cause an object to rotate with an angular acceleration. Because all rotational motions have an axis of rotation, a torque must be defined about a rotational axis. A torque is a force applied to a point on an object about the axis of rotation.
What happens when net torque is zero?
Because there is no net torque acting on an object in equilibrium, an object at rest will stay at rest, and an object in constant angular motion will stay in angular motion. Because the net torque is equal to zero, the torques in Example 1 are balanced and acting in equilibrium.
Can you have negative torque?
Torque is a vector quantity that has direction as well as magnitude. Turning the handle of a screwdriver clockwise and then counterclockwise will advance the screw first inward and then outward. By convention, counterclockwise torques are positive and clockwise torques are negative.
What is the difference between positive torque and negative torque?
Significance. Note that each force that acts in the counterclockwise direction has a positive torque, whereas each force that acts in the clockwise direction has a negative torque. The torque is greater when the distance, force, or perpendicular components are greater.
Why are clockwise moments considered negative?
Clockwise moments are considered negative when summed with counterclockwise moments because they are opposites of each other, but also because counterclockwise moments are positive since when acting upon an object, they move the object up on the Y-Axis.
What is negative torque system?
Definition. Negative Torque is said to occur when conditions are such that air loading on a propeller causes it to drive the engine to which it is attached vice the normal condition in which the engine drives the propeller.
Which is better turboprop or jet?
A turbine engine is extremely light and produces tremendous power-to-weight as opposed to a comparable piston engine. Conversely, jet engines are less efficient than a turboprop but often make up for it by being faster, hence spending less time in the air for the same destination.
Why Are turboprops more efficient at low speeds?
Compared to turbofans, turboprops are most efficient at flight speeds below 725 km/h (450 mph; 390 knots) because the jet velocity of the propeller (and exhaust) is relatively low.
What is a hot start turbine?
A “hot start” in any variant of a jet engine refers to the circumstance where the manufacturer defined limiting temperature for start has been exceeded. The most common reasons for a hot start include insufficient airflow through the compressor, incorrect fuel scheduling and slow engine acceleration.
How does a turbine engine start?
The compressed air passes through a small turbine on the outside of the engine, causing it to spin. Attached to the turbine is a shaft which is joined by gears to the main engine shaft, and that begins spinning as well. “The blades connected to the engine shaft then start rotating faster and faster,” explains Brand.
Will a hung start damage a turbine engine?
HUNG START – In gas turbine engines, a condition of normal light off but with rpm remaining at some low value rather than increasing to the normal idle rpm. The fuel to the engine must be terminated immediately to prevent engine damage. TURBINE ENGINE HOT/HUNG START. A hot start is when the EGT exceeds the safe limit …
What is the purpose of a hot start?
In simpler terms, the “hot start” function allows the metals to fuse together easier at the very beginning of the weld in order for it to continue to go well.
What is jet engine Hang start?
A hung start occurs when the engine lights off normally but doesn’t accelerate to idle RPM. This is usually the result of insufficient power to the engine from the starter. Live from the Flight Deck.
Why is it normal to have high temps during the engine starting procedure?
If the fuel is ignited before there is enough air flowing around the chamber, its temperature will increase dramatically and exceed the design limits of the combustion chamber and turbine blades, thus causing a failure. This condition is known as a hot start.
What can cause hot starting problems?
My Car Is Hard to Start When Warm
- Clogged air filter.
- Corroded or loose battery terminal or cable.
- Corroded or loose engine ground connection.
- Vapor lock in the fuel system.
- Faulty fuel system.
- Engine control system problems.
- One or more electrical sensors.
What causes hard starting engine?
When an engine cranks for a long time before it starts, either spark or fuel is missing or weak and each has its own reasons. Most of the time, the air / fuel mixture has been disturbed and there is too much air or not enough fuel.
What causes a car not to start in hot weather?
The most common reason why a hot engine will not start is because the problem is related to fuel. When your new car engine is too hot, fuel cannot circulate well, due to the way vapor obstructs its workings and therefore the engine just will not start, as it should. Then go and get a high quality engine coolant.