(i) On reversing the direction of current,
the conductor gets deflected in the upward direction
. i.e., the direction of conductor reverses. (ii) If the magnitude of current is doubled, it will result in doubling the magnitude of the force.
What happens to force when current is reversed?
Direction of force remains same
.
What happens to force when direction of magnetic field is reversed?
(c) When the direction of current and magnetic field is reversed, there is no change in the direction of force as the angle, theta,
is constant
. (d) When the direction of the magnetic field remains constant and the current is reversed, the direction of the force changes due to the variation of the angle, theta.
What happens when the direction of the current through the conductor is reversed?
Answer: When you reverse the direction of the current flowing in the wire,
the north and south poles are also reversed
. When you reverse the current again, the north and south poles reverse again. In fact, each time the current is reversed, the north and south poles will exchange places.
What happens to the direction of force if the direction of current changes but the magnetic field stays the same?
A voltmeter was connected across the coil and the induced EMF read as a magnet was passed through the coil
. The setup is shown in Figure 2. Figure 2: Faraday’s experiment: a magnet is passed through a coil. Figure 2: Faraday’s experiment: a magnet is passed through a coil.
What happens when you change the direction of the magnetic field?
This means when you change the direction of the current, you also change the direction of the magnetic field. … Because the magnetic field created by the electric current in the wire is changing directions around the wire,
it will repel both poles of the magnet by bending away from the wire
.
What happens if the direction of current and magnetic field is reversed simultaneously?
(iii) If both current and the magnetic field were reversed simultaneously then
the direction of rotation of a motor would remain unchanged
. Upon reversing either the current or the magnetic field, the direction of the forces acting on the sides of the coil is reversed, and the rotation of the motor gets reversed.
When the direction of current in a conductor is reversed the direction of the magnetic field also reverses True or false?
True
. By right hand thumb rule, we can determine the direction of current with respect to magnetic field and vice versa, and we have found that direction of current becomes opposite along with the direction of magnetic field.
When the direction of current flowing through a coil is reversed the direction of deflection in the needle compass kept near it?
Answer: A simple electric circuit in which a straight copper wire is placed parallel to and over a compass needle. The deflection in the needle
becomes opposite
when the direction of the current is reversed.
Why does the compass needle deflects when it is kept near an electric current?
When a magnet is brought close to it
, the needle gets deflected. 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.
How does the direction of galvanometer change if the current is reversed?
When the magnet is held stationary, the galvanometer shows no deflection. … When the magnet is moved away from the coil,
the galvanometer shows deflection in the opposite direction
indicating the direction of induced current in the reversed direction.
How can the direction of the force on a wire be reversed?
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 can the direction of electromagnetic force be reversed?
Electromagnetic induction
The direction of the induced voltage is reversed
when the magnet is moved out of the coil again
. It can also be reversed if the other pole of the magnet is moved into the coil. If the coil is part of a complete circuit then a current will be induced in the circuit.
What happens when electric field is reversed?
the – lies Entis Ee Case 2: If the direction of electric field is reversed
body falls with an acceleration 2g
. Case 3: If the field is momentarily switched off and again switched on then body moves down with uniform velocity.
What happens to the magnetic field around a conductor when the direction of the current moving in a conductor is reversed?
A magnetic field implies the existence of
two poles
, a north and a south. … Also as the current is reversed the direction of the magnetic field produced around the conductor will also be reversed because as we have said previously, the direction of the magnetic field depends upon the direction of current flow.
Why do the compass needles change direction when the electric current is flowing?
If you hold a compass near a wire through which current is flowing, the needle on the
compass will be deflected
. Since compasses work by pointing along magnetic field lines, this means that there must be a magnetic field near the wire through which the current is flowing.
What happens to the compass needle when the circuit is on?
A: The compass needle moves from magnetic north to a position perpendicular to the wire. … The compass needle moves in response to the electricity because
a magnetic field is created in the wire
when the circuit is connected.
How does the force on the conductor in a magnetic field cause the rotation of the coil in an electric 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.
What happens to a compass needle when brought near a current carrying wire?
When compass needle is brought near to a current carrying wire then
it is deflected and when direction of current is changed then direction of deflection of compass needle is also changed
. This shows the magnetic effect of electricity.
How can a magnetic field be reversed?
“It may be that
you have to weaken the field for several thousand years
in order to get a reversal because the inner core is solid,” Singer says. “If you turn off the magnetic field in the liquid outer core, there’s magnetic energy inside the solid inner core that takes several thousand years to leave.”
What is the direction of the current induced in the coil?
The current induced in the coil creates another field, in
the opposite direction of the bar magnet’s to oppose the increase
. This is one aspect of Lenz’s law—induction opposes any change in flux.
What is the effect on the deflection in the galvanometer when current is increased in the circuit?
| Experiment Deflection of the galvanometer needle | increases decreases | Number of turns increased | Strong magnet is used | Magnet/solenoid moves with grater speed |
|---|
How does the direction of motion of the bar magnet affect the direction of deflection of the galvanometer needle?
If the magnet is moved
, the galvanometer needle will deflect, showing that current is flowing through the coil. When the magnet is moved one way (say, into the coil), the needle deflects one way; when the magnet is moved the other way (say, out of the coil), the needle deflects the other way.
How does galvanometer show direction of current?
The
deflection of the galvanometer needle
indicates the presence of current in the coil. The direction of deflection of the needle gives us the direction of flow of current.
Which direction is the force on the wire?
The magnetic force on a current-carrying wire is
perpendicular to both the wire
and the magnetic field with direction given by the right hand rule.
What is the name of the effect caused by the wire when it is moved across a magnetic field?
The process by which a potential difference is generated across the ends of a conductor when it’s moved through a magnetic field is called
electromagnetic induction
.
What about the reverse possibility of an electric effect of moving magnets?
According to Lenz’s law, a varying magnetic flux linked with a closed coil causes induced emf in the coil such that it opposes the cause that produces it. As the moving magnets produce varying magnetic flux, it can be
concluded that electricity is produced from it
.
What are the two effect of electric current?
Answer: The two effects of electric current are;
heating effect and magnetic effect
.
