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प्रश्न
State Fleming's left-hand rule. Explain it with the help of labelled diagrams.
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उत्तर
According to Fleming's left-hand rule, when thumb, forefinger and central finger are kept mutually perpendicular:
(a) Thumb represents force.
(b) Forefinger represents magnetic field.
(c) Central finger represents current.
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संबंधित प्रश्न
Which of the following property of a proton can change while it moves freely in a magnetic field? (There may be more than one correct answer.)
State Fleming’s left hand rule.
Draw the magnetic lines of force due to a circular wire carrying current.
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 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?
What happens when a current-carrying conductor is placed in a magnetic field?
When is the force experienced by a current-carrying conductor placed in a magnetic field largest?
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.
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
Which way does the wire in the diagram below tend to move?
What is the force on a current-carrying wire that is parallel to a magnetic field? Give reason for your answer.
force experienced by a current-carrying straight conductor placed in a magnetic field which is perpendicular to it.
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 two ways to increase the speed of rotation of a D.C. motor.
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:
Which of the following factors affect the strength of force experience by current-carrying conduct in a uniform magnetic field?
Describe the activity that shows that a current-carrying conductor experiences a force perpendicular to its length and the external magnetic field. How does Fleming’s left-hand rule help us to find the direction of the force acting on the current carrying conductor?
Assertion (A): A current carrying straight conductor experiences a force when placed perpendicular to the direction of magnetic field.
Reason (R): The net charge on a current carrying conductor is always zero.
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.
