Skip to content
CNMS ICSE - 7 Std
Share
Explore

Fill in the Blanks

Prepared by: learnloophq@gmail.com

Chapter: 08. Magnetism

⁠
A magnet which occurs naturally in the Earth is called a _ _ _ _ _ _ _ _ _ _ _ _ _ _.
Natural magnet
One of the naturally occurring magnets in the Earth is magnetite, which has the chemical formula _ _ _ _ _ _ _ _ _ _ _ _ _ _.
Fe₃O₄
Materials like glass, wood, plastic, and copper which are not attracted by a magnet are called _ _ _ _ _ _ _ _ _ _ _ _ _ _ materials.
Non-magnetic
The magnetic force of a magnet is always maximum at its _ _ _ _ _ _ _ _ _ _ _ _ _ _.
Poles
A freely suspended magnet always aligns itself in the _ _ _ _ _ _ _ _ _ _ _ _ _ _ direction.
North-south
It is impossible to have a magnet with only one pole because magnetic poles always exist in _ _ _ _ _ _ _ _ _ _ _ _ _ _.
Pairs
The most basic law of magnetism is that like poles of two magnets _ _ _ _ _ _ _ _ _ _ _ _ _ _ each other.
Repel
Since any substance made of iron, nickel, or cobalt will be attracted to a magnet, _ _ _ _ _ _ _ _ _ _ _ _ _ _ is considered the surest test of magnetism.
Repulsion
A type of magnet in which a magnetic field is produced through electric current is called an _ _ _ _ _ _ _ _ _ _ _ _ _ _.
Electromagnet
The branch of physics which deals with the magnetic effect of electric current is called _ _ _ _ _ _ _ _ _ _ _ _ _ _.
Electromagnetism
An electromagnet consists of a coil of insulated copper wire wound on a soft iron piece called the _ _ _ _ _ _ _ _ _ _ _ _ _ _.
Core
An electromagnet is a _ _ _ _ _ _ _ _ _ _ _ _ _ _ magnet because it retains magnetic properties only when electric current passes through it.
Temporary
The end of an electromagnet where the current flows in a clockwise direction acts as the _ _ _ _ _ _ _ _ _ _ _ _ _ _.
South pole
The strength of an electromagnet is directly proportional to the amount of _ _ _ _ _ _ _ _ _ _ _ _ _ _ flowing through the coil.
Electric current
On increasing the number of turns of the coil, the strength of the electromagnet _ _ _ _ _ _ _ _ _ _ _ _ _ _.
Increases
In an electric bell, the terminals T₁ and T₂ are connected to a battery through a _ _ _ _ _ _ _ _ _ _ _ _ _ _ switch.
Push button
The armature in an electric bell is made of _ _ _ _ _ _ _ _ _ _ _ _ _ _.
Iron
The phenomenon of producing an electric current in a conductor due to change in the magnetic lines of force associated with the conductor is called _ _ _ _ _ _ _ _ _ _ _ _ _ _.
Electromagnetic induction
The current produced in a conductor by the process of electromagnetic induction is called _ _ _ _ _ _ _ _ _ _ _ _ _ _ current.
Induced
A sensitive instrument used for measuring small electric currents is called a _ _ _ _ _ _ _ _ _ _ _ _ _ _.
Galvanometer
According to Faraday’s second law, the magnitude of the induced current is directly proportional to the rate at which the _ _ _ _ _ _ _ _ _ _ _ _ _ _ associated with the coil changes.
Magnetic lines of force
MRI is an abbreviation for _ _ _ _ _ _ _ _ _ _ _ _ _ _ Scan.
Magnetic Resonance Imaging
Unlike a CT scan, there is no exposure to _ _ _ _ _ _ _ _ _ _ _ _ _ _ during an MRI scan.
Radiation
The pioneer experimentalist who discovered electromagnetic induction in the year 1831 was _ _ _ _ _ _ _ _ _ _ _ _ _ _.
Michael Faraday
Gallery
 
Want to print your doc?
This is not the way.
Try clicking the ··· in the right corner or using a keyboard shortcut (
CtrlP
) instead.