In the arrangement shown in the figure, direction of magnetic field produced by a straight current carrying conductor, is given by the direction of north pole of a magnetic compass needle, and it is in the clockwise direction. If the direction of current is reversed, what change you can observe in the north pole of the magnetic compass needle? What would be the direction of magnetic field lines then?
Answers
The given question is based on the concept of right hand thumb rule. We are given an arrangement and we see that when current is flowing through the circuit, direction of magnetic field lines is clockwise, or by using compass, it is moving towards north pole. We are asked what changes will occur when current is reversed and what will be the new direction of compass Needle. Let's understand this question step by step!
• Firstly understand right hand thumb rule:-
According to the rule given by Maxwell (right hand thumb rule), when we imagine to hold a current carrying conductor in our right hand, and our thumb is pointing towards the direction of current then only your curled fingers around the conductor will give you the direction of magnetic fields.
In the given arrangement, we can practically apply this rule by assuming a current carrying conductor in our right hand and current is flowing in the direction of our thumb.
Now move on to the question!
• What changes will be observed in the compass needle by changing current's direction?
» Answer to this question is simple. Since, the direction of current is changed, it will also cause change in the direction of magnetic field lines ( to check this, apply right hand thumb rule).
• What will be the direction of magnetic fields after changing current?
» By applying right hand rule, we can obtain the new direction. The new direction of compass needle will be towards south or the magnetic field lines will be observed as moving anticlockwise when we see it from above.
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Answer:
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UnderstandingtheConcept
The given question is based on the concept of right hand thumb rule. We are given an arrangement and we see that when current is flowing through the circuit, direction of magnetic field lines is clockwise, or by using compass, it is moving towards north pole. We are asked what changes will occur when current is reversed and what will be the new direction of compass Needle. Let's understand this question step by step!
• Firstly understand right hand thumb rule:-
According to the rule given by Maxwell (right hand thumb rule), when we imagine to hold a current carrying conductor in our right hand, and our thumb is pointing towards the direction of current then only your curled fingers around the conductor will give you the direction of magnetic fields.
In the given arrangement, we can practically apply this rule by assuming a current carrying conductor in our right hand and current is flowing in the direction of our thumb.
Now move on to the question!
• What changes will be observed in the compass needle by changing current's direction?
» Answer to this question is simple. Since, the direction of current is changed, it will also cause change in the direction of magnetic field lines ( to check this, apply right hand thumb rule).
• What will be the direction of magnetic fields after changing current?
» By applying right hand rule, we can obtain the new direction. The new direction of compass needle will be towards south or the magnetic field lines will be observed as moving anticlockwise when we see it from above.
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