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tamojit das from techno India Group Public School , Chinsura
Subject :NSO    Class : Class 8

The diagram shows a plotting compass placed above a copper wire when there is no current flowing in the wire. What happens to the compass needle when a large direct current flows from point A to point B?


A The compass needle points towards the right.
B The compass needle points towards the left.
C The compass needle points towards upward.
D The compass needle points toward downward.


Why? please explain this?

Ans 1:

S V Harini from Vailankanni public school , Krishnagiri
Class : Class 8

Ans 2:

Pranav from JSS Public School, Bengaluru
Class : Class 10
The answer is Option A

Ans 3:

Karthik Rao Varam from Bala Vidya Mandir, Chennai
Class : Class 10

Ans 4:

Ayush Gorain from Sarala Birla Public School, Ranchi
Class : Class 8
According to Faraday's right hand rule, electricity flowing from point A to B generates a magnetic field around the wire moving from right to left (above the wire), and left to right (below the wire). Due to the compass being above the wire (according to the question), the compass needle must be influenced by the magnetic field, such that it points towards the right; i.e. the needle points in a direction from left to right. Thus, I opine that option (A) is the correct answer, not option (D). As there is an electric current, there must be a magnetic field, and thus there must be a deflection in the compass, which excludes option (D) entirely.

Ans 5:

Nilanjana De from Delhi Public School North, Bengaluru
Class : Class 8
The solution says that the answer is supposed to be d but according to the explanation given the answer seems to be a. Please explain.

Ans 6:

Arnav Ranka from Gyan Bharati School, Saket, New Delhi
Class : Class 9

Ans 7:

Hprakash09 from Billabong high Bhopal, Bhopal
Class : Class 7
I'm not sure what the answer is in this one, as the correct answer and the solution are mismatched.

Ans 8:

aditya arora from Heritage Experiential Learning School, gurugram
Class : Class 8
should be a

Ans 9:

Gaurish Singla from DPS School Sector 19, Faridabad
Class : Class 8

Ans 10:

Akshara from NPS, Bengaluru
Class : Class 8
It should be A...

Ans 11:

Ayush Chauhan from Modern Public School, Bhiwadi
Class : Class 9

Ans 12:

Dhanya Krishnaji from ISG, Muscat
Class : Class 8
It’s A . The question uses Maxwell’s right thumb rule.

Ans 13:

Sumedha Mishra from xyz, School, Pune
Class : Class 8

Ans 14:

Student from School, City
Class : Class 8
The *solution* and the *option* mismatch.

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