English

An electric bell has an electromagnet.

Advertisements
Advertisements

Question

An electric bell has an electromagnet. 

Options

  • True

  • False

MCQ
True or False
Advertisements

Solution

This statement is True.

Explanation:

An electric bell has a piece of iron wound by a coil. When current passes through this coil, it behaves as an electromagnet.

shaalaa.com
  Is there an error in this question or solution?
Chapter 10: Electric Current and Its Effects - Exercises [Page 120]

APPEARS IN

NCERT Science [English] Class 7
Chapter 10 Electric Current and Its Effects
Exercises | Q 9. (d) | Page 120

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.


Which effect of current can be utilised in detecting a current carrying wire concealed in a wall? 


Fill in the following blank with suitable words: 

The magnetic effect of a coil can be increased by increasing the number of ........... increasing the ........... or inserting an ........... core.


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


If the direction of electric current in a solenoid when viewed from a particular end is anticlockwise, then this end of solenoid will be:

(a) west pole
(b) south pole
(c) north pole
(d) east pole


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


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


How does the magnetic effect of electric current help in the working of an electric bell? Explain with the help of a diagram.


As shown in the diagram an aluminium rod 'AB' is suspended horizontally between the two poles of a strong horse shoe magnet in such a way that the axis of rod is horizontal and the direction of the magnetic field is vertically upward. The rod is connected in series with a battery and a key.

State giving reason:

  1. What is observed when a current is passed through the aluminium rod from end B to end A?
  2. What change is observed in a situation in which the axis of the rod 'AB' is moved and aligned parallel to the magnetic field and current is passed in the rod in the same direction?

Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×