NEET Class neet Answered

Please answer this

Asked by Prashant DIGHE | 02 Nov, 2019, 16:28: PM

Expert Answer

i = 2A

phi subscript 1 space equals space 60 degree space a n d space phi subscript 2 space equals space 30 degree space W e space k n o w comma space B with rightwards arrow on top space equals space fraction numerator mu subscript 0 i over denominator 4 pi r end fraction open parentheses sin space phi subscript 1 space plus space sin space phi subscript 2 space close parentheses space sin space 30 space equals space r over 2 space... space left parenthesis because sin space theta space equals space o p p o s i t e space s i d e divided by space h y p o t e n u s e right parenthesis space 1 half equals space r over 2 therefore space r space equals 1 space m space B with rightwards arrow on top space space equals space fraction numerator 4 space pi cross times 10 to the power of negative 7 space end exponent cross times 2 over denominator 4 pi left parenthesis 1 right parenthesis end fraction open parentheses sin space 60 degree space plus space sin space 30 degree close parentheses space B with rightwards arrow on top space equals space open parentheses fraction numerator square root of 3 over denominator 2 end fraction plus 1 half close parentheses cross times 2 cross times 10 to the power of negative 7 space end exponent space equals space open parentheses square root of 3 space plus 1 space close parentheses cross times 10 to the power of negative 7 space end exponent T

Correct option is 3.

Answered by Shiwani Sawant | 02 Nov, 2019, 17:55: PM

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