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Observe the given figure of Fleming's Left Hand Rule and write the labels of 'A' and 'B': - Science and Technology 1

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प्रश्न

Observe the given figure of Fleming's Left Hand Rule and write the labels of 'A' and 'B':

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उत्तर

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2021-2022 (March) Set 1

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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.


The magnetic field inside a long straight solenoid-carrying current ______.


Which of the following correctly describes the magnetic field near a long straight wire?


State whether the following statement is true or false

The field at the centre of a long circular coil carrying current will be parallel straight lines.


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?


Observe the following figure:

If the current in the coil A is changed, will some current be induced in the coil B? Explain.


What concealed do you get from the observation that a current-carrying wire deflects a compass needle placed near it?


Fill in the following blank with suitable words: 

For a current-carrying solenoid, the magnetic field is like that of a ...........


 What are the various ways in which the strength of magnetic field produced by a current-carrying circular coil can be increased?


State and explain the Clock face rule for determining the polarities of a circular wire carrying current.


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?


 List three ways in which the magnetic field strength of a current-carrying solenoid can be increased?


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?

 

 


 A current-carrying conductor is placed perpendicularly in a magnetic field. Name the rule which can be used to find the direction of force acting on the conductor.


The force exerted on a current-carrying wire placed in a magnetic field is zero when the angle between the wire and the direction of magnetic field is: 

 45°
 60°
 90°
 180°

 


If the current in a wire is flowing in the vertically downward direction and a magnetic field is applied from west to east, what is the direction of force in the wire?


 force experienced by a current-carrying straight conductor placed in a magnetic field which is perpendicular to it. 


How will the direction of force be changed, if the current is reversed in the 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 coil ABCD mounted on an axle is placed between the poles N and S of a permanent magnet as shown in Figure.

  1. 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?
  2. Why is a commutator necessary for continuous rotation of the coil?
  3. Complete the diagram with commutator, etc. for the flow of current in the coil?

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. 

When will coil come to rest?


Differentiate between conductors and insulators.


State under what conditions force acting on a current carrying conductor which is freely suspended in a magnetic field can be maximum.


The north pole of Earth’s magnet is in the ____________.


A current flows in a wire running between the S and N poles of a magnet lying horizontally as shown in the figure below:

The force on the wire due to the magnet is directed ____________.


When current is parallel to a magnetic field, then force experience by the current-carrying conductor placed in a uniform magnetic field is ____________.


The direction of force on a current carrying conductor in a magnetic field is given by ____________.


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?


What do you know about Michael Faraday?


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.


A copper wire is held between the poles of a magnet

The current in the wire can be reversed. The pole of the magnet can also be changed over. In how many of the four directions shown can the force act on the wire?


Which of the following pattern correctly describes the magnetic field around a long straight wire carrying current?


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