मराठी

A positively-charged particle (alpha-particle) projected towards west is deflected towards north by a magnetic field. The direction of magnetic field is ______. - Science

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प्रश्न

A positively-charged particle (alpha-particle) projected towards west is deflected towards north by a magnetic field. The direction of magnetic field is ______.

पर्याय

  • towards south

  • towards east

  • downward

  • upward

MCQ
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उत्तर

A positively-charged particle (alpha-particle) projected towards west is deflected towards north by a magnetic field. The direction of magnetic field is upward.

Explanation:

Applying Fleming's left-hand rule, we can infer that the direction of the magnetic field is upwards.

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पाठ 13: Magnetic Effects of Electric Current - Intext Questions [पृष्ठ २३२]

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एनसीईआरटी Science [English] Class 10
पाठ 13 Magnetic Effects of Electric Current
Intext Questions | Q 3 | पृष्ठ २३२

संबंधित प्रश्‍न

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


What is the shape of a current-carrying conductor whose magnetic field pattern resembles that of a bar magnet?


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


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?

 

 


 Name one device whose working depends on the force exerted on a current-carrying coil placed in a magnetic field. 


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? 


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.

  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?


Write Fleming’s left hand rule.


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


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?


A current-carrying conductor of a certain length, kept perpendicular to the magnetic field experiences a force F. What will be the force if the current is increased four times, the length is halved and the magnetic field is tripled?


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


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?


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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