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Gauri Singh from St Johns School Marhauli, Varanasi
Subject :NSO    Class : Class 6

In which of the following a permanent magnet is not used?

A In magnetic door catchers
B Loudspeakers
C In compasses
D None of these


Ans 1:

SOUVAGYA SAHA from De Nobili School, DHANBAD
Class : Class 10

Ans 2:

NISHTHA GUPTA from DPS R K Puram, newdelhi
Class : Class 10
answer will be b as loudspeakers use electromagents

Ans 3:

Tamrashi Pani from National Public School, Bangalore
Class : Class 8
But all of them use permanent magnets...so D is correct

Ans 4:

Shourya Ganesh from The Green Acres Academy, Mumbai
Class : Class 9

Ans 5:

Veda Dua from Delhi Public School, R. K. Puram, New Delhi
Class : Class 10
Loudspeakers use electromagnets, so the answer is option B

Ans 6:

Shreya Yegna Narayanan from psbb, chennai
Class : Class 6
Loud speakers use electromagnets as they dont need magnetic force when not in use so ans is B

Ans 7:

Shourya Ganesh from The Green Acres Academy, Mumbai
Class : Class 9
Loudspeakers use electromagnets.So,the answer should be (B)

Ans 8:

Joe Bipin from National Public School Agra, Bangalore
Class : Class 10
they use both so the answer is d

Ans 9:

Sharmi Chowdhury from G.D Birla Centre For Education , Kolkata
Class : Class 7
Don't loudspeakers use electromagnets?

Ans 10:

Mridul Jain from Shishukunj International School Indore, Indore
Class : Class 9
The answer is B as loudspeakers use electromagnets and the magnetic field isn't there always .

Ans 11:

Aarush Mallya from EISB, BANGALORE
Class : Class 5
Loud speakers use permanent magnets

Ans 12:

Joe Bipin from National Public School Agra, Bangalore
Class : Class 10
loud speakers have both electromagnets and permanent magnets

Ans 13:

Smita De from Bishop Cotton Girls School, BANGALORE
Class : Class 6
answer is B so obvious

Ans 14:

satwik patnaik from DPS Rourkela, Rourkela
Class : Class 7
answer should be b

Ans 15:

Shayan Bari from Kendriya Vidyalaya, Katihar
Class : Class 7
Loudspeakers use electromagnets.

Ans 16:

Shourya Ganesh from The Green Acres Academy, Mumbai
Class : Class 9
Loudspeakers use electromagnets so it should be answer b

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