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    Physics-
    General
    Easy

    Question

    AB is a section of straight wire carrying a current I. P is a point at a distance d from AB. The magnetic field at P due to AB has magnitude

    1. fraction numerator mu subscript 0 end subscript I over denominator 4 pi d end fraction open parentheses cos invisible function application theta subscript 1 end subscript plus cos invisible function application theta subscript 2 end subscript close parentheses    
    2. fraction numerator mu subscript 0 end subscript I over denominator 4 pi d end fraction open parentheses cos invisible function application theta subscript 1 end subscript minus cos invisible function application theta subscript 2 end subscript close parentheses    
    3. fraction numerator mu subscript 0 end subscript I over denominator 4 pi d end fraction open parentheses sin invisible function application theta subscript 1 end subscript plus sin invisible function application theta subscript 2 end subscript close parentheses    
    4. fraction numerator mu subscript 0 end subscript I over denominator 4 pi d end fraction open parentheses sin invisible function application theta subscript 1 end subscript minus sin invisible function application theta subscript 2 end subscript close parentheses    

    The correct answer is: fraction numerator mu subscript 0 end subscript I over denominator 4 pi d end fraction open parentheses cos invisible function application theta subscript 1 end subscript plus cos invisible function application theta subscript 2 end subscript close parentheses

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