When an electric current flows through a copper wire AB as shown in Figure the wire a deflects a magnetic needle placed near it?
Answer: (a) deflects a magnetic needle placed near it.
A current-carrying wire acts as a magnet with a magnetic field around it, the strength of which depends upon the amount of current passing through it.
When current flows through a copper wire?
When the current flows in the conducting wire then the electron moves in opposite direction. The direction of current density is toward positive charge. It means the current density is opposite direction of motion of electrons. The direction of electric field is toward positive charge.
What happens when electrons pass through a copper wire?
When a voltage is connected across a piece of copper, it pushes the free electrons so that they flow through the metal – that’s an electric current. … It is because the free electrons are already spread through the wire. As soon as the switch is closed, there is a force on all the electrons, which gets them moving.
When the current flows through a wire it shows?
When current flows in a wire, it creates field around it.
When current i flows through a copper wire at room temperature the conductivity is?
So copper which is a good conductor of electric current, has a conductivity of 58.14 x 106 siemens per metre.
What changes takes place in the current in circuit at the time of short circuit?
At the time of short circuit, the current in the circuit increases heavily, so the answer to this question is option c. When it comes to a short circuit, it is the electrical circuit which lets current for travelling along the unintended path with less or no electrical impedance.
When current flows through a copper wire current density J electric field E and motion of electrons have directions such that?
When current flows through copper wire, current density J, electric field E and motion of electrons have directions such that. J and motion of electrons ore In the same direction. J, E and motion of electrons are In same direction.
Which one of the following is based on the heating effect of current?
Answer: An electric fuse is a safety device that works on the principle of the heating effect of electric current.
When current is passed through a conductor the heat produced in it depends upon?
The heating effect of an electric current depends on three factors: The resistance, R of the conductor. A higher resistance produces more heat. The time, t for which current flows.
What happens to electrons in a current?
They end up getting pushed out through the air, the water, or whatever surrounds the object. We call a collection of moving electrons an electric current, therefore a buildup of charge can drive a current. The electrons simply flow away from the pile and ultimately end up attached to atoms in the environment.
How do electrons flow through wires?
Electrons move through a wire from the negative end to the positive end. The resistor uses the energy of the electrons around the wire and slows down the flow of electrons. A battery is one way to generate electric current.
What makes an electric current flow in a wire?
a) A flow of charges or electrons through a conductor is called an electric current. The potential difference between the two ends makes the electric current flow through the wire.
When an electric current passes through a wire does it act?
When an electric current passes through a wire, it behaves like a magnet. This magnetic effect of the electric current makes the compass needle deflect from the north-south direction.
What happens when electric current flows through a looped wire?
A current traveling through a loop of wire creates a magnetic field along the axis of the loop. The direction of the field inside the loop can be found by curling the fingers of the right hand in the direction of the current through the loop; the thumb then points in the direction of the magnetic field.