हिंदी
कर्नाटक बोर्ड पी.यू.सी.पीयूसी विज्ञान 2nd PUC Class 12

Use Lenz’s law to determine the direction of induced current in the situation described by the figure: A wire of irregular shape turning into a circular shape. - Physics

Advertisements
Advertisements

प्रश्न

Use Lenz’s law to determine the direction of induced current in the situation described by the figure:

A wire of irregular shape turning into a circular shape.

संक्षेप में उत्तर
Advertisements

उत्तर

According to Lenz’s law, the direction of the induced emf is such that it tends to produce a current that opposes the change in the magnetic flux that produced it.

A greater area and, by extension, a stronger magnetic flux, are the results of a change in shape. In order to create opposing flux, Lenz's law is used to build up an induced current in the circular wire in an anticlockwise direction. Thus, the upward-directed magnetic field is a result of it.

shaalaa.com
  क्या इस प्रश्न या उत्तर में कोई त्रुटि है?
अध्याय 6: Electromagnetic Induction - EXERCISES [पृष्ठ १७५]

APPEARS IN

एनसीईआरटी Physics Part 1 and 2 [English] Class 12
अध्याय 6 Electromagnetic Induction
EXERCISES | Q 6.2 (a) | पृष्ठ १७५

वीडियो ट्यूटोरियलVIEW ALL [1]

संबंधित प्रश्न

Predict the direction of induced current in the situation described by the following figure.


What is the direction of induced currents in metal rings 1 and 2 when current I in the wire is increasing steadily? 


Show that Lenz's law is a consequence of conservation of energy.


A short magnet is moved along the axis of a conducting loop. Show that the loop repels the magnet if the magnet is approaching the loop and attracts the magnet if it is going away from the loop.


The battery discussed in the previous question is suddenly disconnected. Is a current induced in the other loop? If yes, when does it start and when does it end? Do the loops attract each other or repel?


A pivoted aluminium bar falls much more slowly through a small region containing a magnetic field than a similar bar of an insulating material. Explain.


A bar magnet is released from rest along the axis of a very long, vertical copper tube. After some time the magnet ____________ .


A bar magnet is moved along the axis of a copper ring placed far away from the magnet. Looking from the side of the magnet, an anticlockwise current is found to be induced in the ring. Which of the following may be true?
(a) The south pole faces the ring and the magnet moves towards it.
(b) The north pole faces the ring and the magnet moves towards it.
(c) The south pole faces the ring and the magnet moves away from it.
(d) The north pole faces the ring and the magnet moves away from it.


Lenz’s law is a consequence of the law of conservation of ______.


Which of the following statements is not correct?


There are two coils A and B as shown in figure. A current starts flowing in B as shown, when A is moved towards B and stops when A stops moving. The current in A is counterclockwise. B is kept stationary when A moves. We can infer that ______.


Same as problem 4 except the coil A is made to rotate about a vertical axis (figure). No current flows in B if A is at rest. The current in coil A, when the current in B (at t = 0) is counterclockwise and the coil A is as shown at this instant, t = 0, is ______.


A metallic ring of mass m and radius `l` (ring being horizontal) is falling under gravity in a region having a magnetic field. If z is the vertical direction, the z-component of magnetic field is Bz = Bo (1 + λz). If R is the resistance of the ring and if the ring falls with a velocity v, find the energy lost in the resistance. If the ring has reached a constant velocity, use the conservation of energy to determine v in terms of m, B, λ and acceleration due to gravity g.


A long solenoid ‘S’ has ‘n’ turns per meter, with diameter ‘a’. At the centre of this coil we place a smaller coil of ‘N’ turns and diameter ‘b’ (where b < a). If the current in the solenoid increases linearly, with time, what is the induced emf appearing in the smaller coil. Plot graph showing nature of variation in emf, if current varies as a function of mt2 + C.


A coil is suspended in a uniform magnetic field, with the plane of the coil parallel to the magnetic lines of force. When a current is passed through the coil it starts oscillating: It is very difficult to stop. But if an aluminium plate is placed near to the coil, it stops. This is due to:


Predict the direction of induced current in the situation described by the following figure.


Predict the direction of induced current in the situation described by the following figure.


Predict the direction of induced current in the situation described by the following figure.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×