What happens to the direction of force if the direction of current changes but the magnetic field stays the same?

What happens to the direction of force if the direction of current changes but the magnetic field stays the same?

If the forefinger points in the direction of the magnetic field and the middle finger in the direction of the current, then, the thumb points in the direction of the force exerted on the conductor.So, if the current is reversed in the conductor placed in a magnetic field the direction of force is also reversed.

How do you reverse the direction of a force?

The direction of the current must be reversed every half turn, otherwise the coil comes to a halt again. This is achieved using a conducting ring split in two, called a split ring or commutator. A coil of wire is used with lots of turns to increase the effect of the magnetic field.

How do you change the direction of force on a motor?

How to make the motor turn the other way

1. Reverse the current. One way to change the direction of the motor is to reverse the battery.
2. Reverse the magnetic fields. Another way to change the direction of the motor is to reverse the positions of the magnetic fields (N and S) .
3. Reverse the current and the magnetic field.

How can you change the direction of force on a wire?

Note that the direction of the force can be changed by changing either the direction of the current or the field….The force on a given length of wire in a magnetic field increases when:

1. the current in the wire increases.
2. the strength of the magnetic field increases.
3. the length of conductor in the field is increased.

What makes a coil spin in the opposite direction?

When a current flows through the coil there is a force on the coil. The side marked 1 is forced upwards and the side marked 2 is forced downwards. The coil turns in an ANTICLOCKWISE DIRECTION. The inertia of the coil keeps it turning between each contact with the two input wires (+ and – ).

How is rotation caused in a motor?

The coil of wire is mounted in the gap between the two magnets. The split rings make electrical contact with the coil and reverse the current every half turn. When an electric current flows through the coil, a force is exerted on the coil, causing it to spin.

Which rule can be used to work out which way a coil of wire rotates in a motor?

The direction of the force on the wire is determined by Fleming’s left-hand rule. The motor effect is when a coil of current-carrying wire rotates due to its presence in a magnetic field.