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What is the Force on a Current-carrying Wire that is Parallel to a Magnetic Field? Give Reason for Your Answer.

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प्रश्न

What is the force on a current-carrying wire that is parallel to a magnetic field? Give reason for your answer. 

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उत्तर

The force on a current-carrying wire parallel to the magnetic field is zero because the magnetic force on the wire is due to the force experienced by moving electrons in the conductor. Further, the magnetic force has rotatory effect on electron motion only. Therefore, in parallel condition, this rotating effect is zero and this results in zero force on the conductor.

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अध्याय 2: Magnetic Effects of Electric Current - Exercise 3 [पृष्ठ ९३]

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लखमीर सिंग Physics [English] Class 10
अध्याय 2 Magnetic Effects of Electric Current
Exercise 3 | Q 35 | पृष्ठ ९३

संबंधित प्रश्न

State the form of magnetic field lines around a straight current-carrying conductor.


Name and state the rule to determine the direction of magnetic field around a straight current-carrying conductor.


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


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.


Which way does the wire in the diagram below tend to move? 

 


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?


State condition when magnitude of force on a current carrying conductor placed in a magnetic field is maximum?


 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?

Name the following diagram and explain the concept behind it.


A flat coil ABCD is freely suspended between the pole pieces of a U-shaped permanent magnet with the plane of coil parallel to the magnetic field.

When will the couple acting on the coil be

  1. maximum
  2. minimum?

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


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


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


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.

  1. For this position, state the direction of the force on the arm AB.
  2. Why does the current in the arm BC not contribute to the turning force on the coil?

An alpha particle enters a uniform magnetic field as shown. The direction of force experienced by the alpha particle is ______.


A copper conductor is placed over two stretched copper wires whose ends ate connected to a D.C. supply as shown in the diagram.

  1. 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?
  2. Name the law used to find these polarities.


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