Two identical coils, each with $N$ turns and radius $R$, are placed coaxially at a distance $R$ from each other, carrying the same current $I$ in the same direction. Find the magnetic field at a point P, on the common axis, at a distance $R/2$ from the centre of each coil. [the four answer options in the source scan show a coefficient/exponent layout that flattened during OCR -- in particular, options (a) and (c) rendered identically as plain text even though the source clearly intends them to differ -- so the options could not be verbatim-transcribed with confidence; held rather than guessed]

Two identical coils, each with N turns and radius R, are placed coaxially at a distance R from each other, car

I. Multiple Choice Questions · Q7

N

(a) and

(c) rendered identically as plain text even though the source clearly intends them to differ -- so the options could not be verbatim-transcribed with confidence; held rather than guessed]

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