English

Unscramble the following words: HTRCO

Advertisements
Advertisements

Question

Unscramble the following words:

HTRCO

One Word/Term Answer
Advertisements

Solution

TORCH

shaalaa.com
  Is there an error in this question or solution?
Chapter 14: Electric Current and Its Effects - VERY SHORT ANSWER QUESTIONS [Page 77]

APPEARS IN

NCERT Exemplar Science [English] Class 7
Chapter 14 Electric Current and Its Effects
VERY SHORT ANSWER QUESTIONS | Q 9. (iii) | Page 77

RELATED QUESTIONS

Will the compass needle show deflection when the switch in the circuit shown by figure is closed?


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


Fill in the following blank with suitable words:

 If a coil is viewed from one end and the current flows in an anticlockwise direction, then this end is a ........... pole.


Name one device which works on the magnetic effect of current.


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 S-pole is inserted?


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.


(ii) Global warming is a desirable aspect of the intensified greenhouse effect.


______ are also used to remove splinters of steel or iron in hospitals dealing with eye injuries.


A student was asked to perform an experiment to study the force on a current carrying conductor in a magnetic field. He took a small aluminium rod AB, a strong horse shoe magnet, some connecting wires, a battery and a switch and connected them as shown. He observed that on passing current, the rod gets displaced. On reversing the direction of current, the direction of displacement also gets reversed. On the basis of your understanding of this phenomenon, answer the following questions: 

  1. Why does the rod get displaced on passing current through it?
  2. State the rule that determines the direction of the force on the conductor AB.
    1. If the U-shaped magnet is held vertically and the aluminium rod is suspended horizontally with its end B towards due north, then on passing current through the rod from B to A as shown, in which direction will the rod be displaced?
    2. Name any two devices that use current carrying conductors and magnetic fields.

OR

Draw the pattern of magnetic field lines produced around a current carrying straight conductor held vertically on a horizontal cardboard. Indicate the direction of the field lines as well as the direction of current flowing through the conductor.


Using an electromagnet, you can make a working model of a railway signal as shown in figure.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×