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प्रश्न
Write Fleming’s left hand rule.
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उत्तर
Stretch the index finger, the middle finger, and the thumb of the left hand mutually perpendicular to each other. If the index finger is in the direction of the magnetic field and the middle finger points in the direction of the current, then the thumb will point towards the direction of the force on the conductor.
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संबंधित प्रश्न
State Fleming’s left-hand rule.
Which of the following correctly describes the magnetic field near a long straight wire?
When is the force experienced by a current-carrying conductor placed in a magnetic field largest?
Imagine that you are sitting in a chamber with your back to one wall. An electron beam, moving horizontally from back wall towards the front wall, is deflected by a strong magnetic field to your right side. What is the direction of magnetic field?
What is the shape of a current-carrying conductor whose magnetic field pattern resembles that of a bar magnet?
Fill in the following blank with suitable words:
For a current-carrying solenoid, the magnetic field is like that of a ...........
Draw a sketch to show the magnetic lines of force due to a current-carrying straight conductor.
What are the various ways in which the strength of magnetic field produced by a current-carrying circular coil can be increased?
Name any two factors on which the strength of magnetic field produced by a current-carrying solenoid depends. How does it depend on these factors?
Name the type of magnet with which the magnetic field pattern of a current-carrying solenoid resembles
What is the shape of field lines inside a current-carrying solenoid? What does the pattern of field lines inside a current-carrying solenoid indicate?
What type of core should be put inside a current-carrying solenoid to make an electromagnet?
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
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
The magnetic field associated with a current-carrying straight conductor is in anticlockwise direction. If the conductor was held along the east-west direction, what will be the direction of current through it? Name and state the rule applied to determine the direction of current?
A current-carrying conductor is held in exactly vertical direction. In order to produce a clockwise magnetic field around the conductor, the current should passed in the conductor:
(a) from top towards bottom
(b) from left towards right
(c) from bottom towards top
(d) from right towards left
What happens when a current-carrying conductor is placed in a magnetic field?
The force experienced by a current-carrying conductor placed in a magnetic field is the largest when the angle between the conductor and the magnetic field is:
45°
60°
90°
180°
A horizontal wire carries a current as shown in Figure below between magnetic poles N and S:
Is the direction of the force on the wire due to the magnet:
(a) in the direction the current
(b) vertically downwards
(c) opposite to the current direction
(d) vertically upwards
In the simple electric motor of figure given below, the coil rotates anticlockwise as seen by the eye from the position X when current flows in the coil
Is the current flowing clockwise or anticlockwise around the coil when viewed from above?
What is the force on a current-carrying wire that is parallel to a magnetic field? Give reason for your answer.
Name three factors on which the magnitude of force on a current carrying conductor placed in a magnetic field depends and state how does the force depend on the factors stated by you.
State condition when magnitude of force on a current carrying conductor placed in a magnetic field is zero?
Name and state the law which is used to determine the direction of force on a current carrying conductor placed in a magnetic field.
State the unit of magnetic field in terms of the force experienced by a current carrying conductor placed in a magnetic field
A flat coil ABCD is freely suspended between the pole of U-shaped permanent magnet with the plane of coil parallel to the magnetic field.
What happens when a current is passed in the coil?
A coil ABCD mounted on an axle is placed between the poles N and S of a permanent magnet as shown in Figure.
- In which direction will the coil begin to rotate when current is passed through the coil in direction ABCD by connecting a battery at the ends A and D of the coil?
- Why is a commutator necessary for continuous rotation of the coil?
- Complete the diagram with commutator, etc. for the flow of current in the coil?
Name the following diagram and explain the concept behind it.
State Fleming’s left-hand rule.
The following diagram shows two parallel straight conductors carrying the same current. Copy the diagram and draw the pattern of the magnetic field lines around them showing their directions. What is the magnitude of the magnetic field at a point 'X' which is equidistant from the conductors? Give justification for your answer.
State under what conditions force acting on a current carrying conductor which is freely suspended in a magnetic field can be Zero.
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 ____________.
When current is parallel to a magnetic field, then force experience by the current-carrying conductor placed in a uniform magnetic field is ____________.
A magnetic field directed in north direction acts on an electron moving in east direction. The magnetic force on the electron will act ____________.
The direction of force on a current carrying conductor in a magnetic field is given by ____________.
Which of the following pattern correctly describes the magnetic field around a long straight wire carrying current?
A copper conductor is placed over two stretched copper wires whose ends ate connected to a D.C. supply as shown in the diagram.
- What should be the magnetic poles at the points A and B lying on either side of the conductor to experience the force in the upward direction?
- Name the law used to find these polarities.
