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प्रश्न
What type of core should be put inside a current-carrying solenoid to make an electromagnet?
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उत्तर
A soft iron rod should be put inside a current-carrying solenoid to make an electromagnet.
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संबंधित प्रश्न
State Fleming’s left-hand rule.
Draw a sketch to show the magnetic lines of force due to a current-carrying straight conductor.
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 front face of a circular wire carrying current behaves like a north pole. The direction of current in this face of circular wire is:
(a) clockwise
(b) downwards
(c) anticlockwise
(d) upwards
What happens when a current-carrying conductor is placed in a magnetic field?
In a statement of Fleming's left-hand rule, what do the following represent?
(a) direction of centre finger.
(b) direction of forefinger.
(c) direction of thumb.
State Fleming's left-hand rule. Explain it with the help of labelled diagrams.
Which way does the wire in the diagram below tend to move?
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.
State whether a magnetic field is associated or not around a moving charge.
State under what conditions force acting on a current carrying conductor which is freely suspended in a magnetic field can be maximum.
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 shape of the magnetic field lines produced by a current-carrying conductor is ____________.
The diagram below shows a free conductor AB is kept in a magnetic field and is carrying current from A to B. (To avoid confusion complete path of the circuit is not shown) The direction of the force experienced by the conductor will be:
For a current in a long straight solenoid N- and S-poles are created at the two ends. Among the following statements, the incorrect statement is
A simple motor is made in a school laboratory. A coil of wire is mounted on an axle between the poles of a horseshoe magnet, as illustrated.
In the example above, coil ABCD is horizontal and the battery is connected as shown.
- For this position, state the direction of the force on the arm AB.
- Why does the current in the arm BC not contribute to the turning force on the coil?
Which of the following pattern correctly describes the magnetic field around a long straight wire carrying current?
If the strength of the current flowing through a wire is increased, the strength of the magnetic field produced by it ______.
