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Q.

The strength of the magnetic field around a straight conductor


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a

Is same everywhere around the conductor

b

Obey inverse square law

c

Is directly proportional to the square of the distance from the conductor

d

None of the above 

answer is D.

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Detailed Solution

The strength of the magnetic field around a straight conductor would be none of the above option.
When current is passing through a straight wire, it will create a magnetic field around the wire. The magnetic field has greater strength when it is close to the wire. The magnetic field can never be endless or straight. The magnetic field will be weaker as the distance is increased.
 
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The strength of the magnetic field around a straight conductor