Advertisements
Advertisements
Question
Suppose you are given a long bar magnet and you are asked to break it into four small magnets. Draw diagrams showing the polarities of each broken part.
Advertisements
Solution
APPEARS IN
RELATED QUESTIONS
You are given an iron nail, a torch cell, and a long piece of insulated copper wire. With the help of a labelled neat diagram, describe in steps how you will make the nail, an electromagnet.
Name and state the rule by which polarity at the ends of a current carrying solenoid is determined.
Name the type of transformer shown in fig . What changes will you observe regarding the brightness of the lamp, if
(a) The no. of turns in the secondary is doubled?
(b) The part X of the transformer is removed?
( c) The core of the transformer is made out of copper?
(d ) The A.C. supply is replaced by D.C.?
The magnetic flux through a coil having 100 turns decreases from 5 milli weber to zero in 5 second. Calculate the e.m.f. induced in the coil.
Answer the following in short.
Name a few common appliances that use electromagnets.
State two advantages of an electromagnet over a bar magnet.
What energy conversion takes place during the working of a d c motor?
State the energy change that takes’place in a D. C. motor.
State the factors, on which depends the magnitude of the force acting on current carrying conductor, when it is kept in a magnetic field perpendicular to it.
Which magnet will you use?
Iron is to be separated from trash.
