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प्रश्न
Two coils A and B of insulated wire are kept close to each other. Coil A is connected to a galvanometer while coil B is connected to a battery through a key. What would happen if:
the current is stopped by removing the plug from the key?
Explain your answer mentioning the name of the phenomenon involved.
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उत्तर
In this case, galvanometer pointer moves to other side. This shows that the direction of induced current is reversed and then quickly returned to zero.
This phenomenon is based on the principle of electromagnetic induction.
संबंधित प्रश्न
Consider a circular loop of wire lying in the plane of the table. Let the current pass through the loop clockwise. Apply the right-hand rule to find out the direction of the magnetic field inside and outside the loop.
State Fleming’s left hand rule.
What is the shape of a current-carrying conductor whose magnetic field pattern resembles that of a bar magnet?
What is a solenoid? Draw a sketch to show the magnetic field pattern produced by a current-carrying solenoid.
The diagram given below represents magnetic field caused by a current-carrying conductor which is:
(a) a long straight wire
(b) a circular coil
(c) a solenoid
(d) a short straight wire
A soft iron bar is inserted inside a current-carrying solenoid. The magnetic field inside the solenoid:
(a) will decrease
(b) will increase
(c) will become zero
(d) will remain the same
The magnetic field lines in the middle of the current-carrying solenoid are?
(a) circles
(b) spirals
(c) parallel to the axis of the tube
(d) perpendicular to the axis of the tube
When is the force experienced by a current-carrying conductor placed in a magnetic field largest?
Name one device whose working depends on the force exerted on a current-carrying coil placed in a magnetic field.
State Fleming's left-hand rule. Explain it with the help of labelled diagrams.
Two coils A and B of insulated wire are kept close to each other. Coil A is connected to a galvanometer while coil B is connected to a battery through a key. What would happen if:
a current is passed through coil B by plugging the key?
Explain your answer mentioning the name of the phenomenon involved.
State condition when magnitude of force on a current carrying conductor placed in a magnetic field is maximum?
How will the direction of force be changed, if the current is reversed in the conductor placed in a magnetic field?
State two ways to increase the speed of rotation of a D.C. motor.
A flat coil ABCD is freely suspended between the pole of a U-shaped permanent magnet with the plane of coil parallel to the magnetic field.
Name an instrument which makes use of the principle stated above.
A current-carrying conductor is held in an exactly vertical direction. In order to produce a clockwise magnetic field around the conductor, the current should be passed in the conductor:
The direction of force on a current carrying conductor in a magnetic field is given by ____________.
Assertion (A): A magnetic field exerts a force on a moving charge in the same direction as the direction of the field itself.
Reason (R): The direction of force is given by Fleming’s left-hand rule.
Which of the following pattern correctly describes the magnetic field around a long straight wire carrying current?
