Ask a Doubt
Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 7 Answered

mention few differences between an electromagnet and a permanant magnet.
Asked by Shreeya Nemani | 25 Aug, 2018, 02:45: PM
answered-by-expert Expert Answer

Electromagnet

Permanent magnet

It is made of sot iron

It is made of mild steel

It produces magnetic field only when current flows in the coil

It produces permanent magnetic field

Magnetic field strength can be changed

Strength of magnetic field can not be changed

It can produce strong magnetic field

Magnetic field of permanent magnet is not so strong

Polarity of magnetic field can be reversed

Polarity can not be reversed

It can be easily demagnetized by switching off the current

It can not be easily demagnetized

Electromagnet

Permanent magnet

1.       It is made of sot iron

It is made of mild steel

2.       It produces magnetic field only when current flows in the coil

It produces permanent magnetic field

3.       Magnetic field strength can be changed

Strength of magnetic field can not be changed

4.       It can produce strong magnetic field

Magnetic field of permanent magnet is not so strong

5.       Polarity of magnetic field can be reversed

Polarity can not be reversed

6.       It can be easily demagnetized by switching off the current

It can not be easily demagnetized
Answered by Thiyagarajan K | 27 Aug, 2018, 04:29: PM

Concept Videos

Multiple Choice Questions Practice Test
Answered Unanswered My Questions My Answers
CBSE 7 - Science
what is nutrition
Asked by n6583499 | 15 Apr, 2024, 10:37: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 7 - Science
scouring of the wool is the procedure in which the wool is
Asked by seenusiri41 | 27 Mar, 2024, 04:52: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 7 - Science
worksheet on nutrition in plants 🌵
Asked by nishakmishra | 27 Mar, 2024, 04:09: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 7 - Science
definition of spore formation
Asked by jidnyeshdeshpande | 20 Mar, 2024, 06:46: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 7 - Science
what is the chemical used to diesnefct water
Asked by anil.kumar.darc | 15 Mar, 2024, 06:43: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 7 - Science
explain the process of self pollination and cross pollination
Asked by pinkikahar66 | 14 Mar, 2024, 06:41: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 7 - Science
what is internet addressing
Asked by kalavatisolunke | 14 Mar, 2024, 12:46: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 7 - Science
what is septum
Asked by neha8400987351 | 11 Mar, 2024, 07:42: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 7 - Science
Rahul took some grains of boiled rice in test tube ‘A’ and Akshay took boiled and chewed rice in test tube ‘B’. Both of them poured 1-2 drops of iodine solution into the test tube and observed the colour change. What colour change would they have observed? Give reasons for your answer.
Asked by sa6128142 | 10 Mar, 2024, 06:26: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 7 - Science
bords have forelimbs but they do not look like a limb . what do they appear.
Asked by nishakmishra | 10 Mar, 2024, 01:16: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt
Get Latest Study Material for Academic year 24-25 Click here
×