English

A Coil is Connected to a Galvanometer. When the N-pole of Magnet is Pushed into the Coil, the Galvanometer Deflected to the Right. What Deflection, If Any, is Observed When: The N-pole is Removed?

Advertisements
Advertisements

Question

A coil is connected to a galvanometer. When the N-pole of magnet is pushed into the coil, the galvanometer deflected to the right. What deflection, if any, is observed when:  

 the N-pole is removed?



Advertisements

Solution

 When the N-pole of a magnet is removed, deflection will take place in left direction because the induced current will flow in other direction.

shaalaa.com
  Is there an error in this question or solution?
Chapter 5: Magnetic Effects of Electric Current - Exercise 4 [Page 105]

APPEARS IN

Lakhmir Singh Physics [English] Class 10
Chapter 5 Magnetic Effects of Electric Current
Exercise 4 | Q 37.1 | Page 105

RELATED QUESTIONS

An electromagnet does not attract a piece of iron.


Do you think an electromagnet can be used for separating plastic bags from a garbage heap? Explain.


Describe some experiment to show that the magnetic field is associated with an electric current. 


The magnetic effect of current was discovered by:

(a) Maxwell
(b) Fleming
(c) Oersted
(d) Faraday


For the coil in the diagram below, when the switch is pressed:

(a) what is the polarity of end A?
(b) which way will the compass point then?    


When the switch S is closed in the figure given below, the pointer of the galvanometer moves to the right.  

 

If S is kept closed, will the pointer:

(a) return to zero?
(b) stay over on the right?
(c) move to the left and stay there
(d) move to and fro until S is opened


If fuse of 250 mA, 500 mA, 1 A, 5 A and 10 A were available, which one would be the most suitable for protecting an amplifier rated at 240 V, 180 W?  


In the Activity shown below, how do we think the displacement of rod AB will be affected if

  1. current in rod AB is increased
  2. a stronger horse-shoe magnet is used
  3. length of the rod AB is increased?
  • Take a small aluminium rod AB (of about 5 cm). Using two connecting wires suspend it horizontally from a stand, as shown in Fig.
  • Place a strong horse-shoe magnet in such a way that the rod lies between the two poles with the magnetic field directed upwards. For this put the north pole of the magnet vertically below and south pole vertically above the aluminium rod (Fig.).
  • Connect the aluminium rod in series with a battery, a key and a rheostat.
  • Now pass a current through the aluminium rod from end B to end A.
  • What do you observe? It is observed that the rod is displaced towards the left. You will notice that the rod gets displaced.
  • Reverse the direction of current flowing through the rod and observe the direction of its displacement. It is now towards the right.
  • Why does the rod get displaced?


A current-carrying rod, AB, experiences a force perpendicular to its length and the magnetic field. Support for the magnet is not shown here, for simplicity.


(c) Considering the relationship in the first pair, complete the second paie :
AgCI : White :: CuI2 : ___________


Read the given passage and answer the following questions:

The home electrical connection consists of ‘live’, ‘neutral’ and ‘earth’ wires. The ‘live’ and the ‘neutral’ wires have potential difference of 220 V. The ‘earth’ is connected to ground. Due to a fault in the equipment or if the plastic coating on the ‘live’ and the ‘neutral’ wires gives a way the two wires come in contact with each other and a large current flows through it producing heat. If any inflammable material (such as wood, cloth, plastic, etc.) exists around that place it can catch fire. Therefore a fuse wire is used as a precautionary measure.

  1. Name the two wires having potential difference of 220 V.
  2. What is a short circuit?
  3. Write the function of a fuse.

Magnetic effect of current was discovered by ______.


Paheli does not have a night lamp in her room. She covered the bulb of her room with a towel at the night to get dim light. Has she taken the right step? Give one reason to justify your answer.


Why do we cover plug pin holes which are within the reach of children with cellotape or a plastic cover when not in use?


Edison used a ______ wire coil is a vacuum glass and discovered the first electric bulb in 1879.


______ cells cannot be recharged after use.


A rectangular loop ABCD carrying a current I is situated near a straight conductor XY, such that the conductor is parallel to the side AB of the loop and is in the plane of the loop. If a steady current I is established in the conductor as shown, the conductor XY will ______.


Make four electromagnets with 20, 40, 60 and 80 turns. Connect them one by one to a battery of 2 cells. Bring the electromagnet near a box of pins. Count the number of pins attracted by it. Compare the strengths of the electromagnets.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×