Two solenoids acting as short bar magnet...

Two solenoids acting as short bar magnets P and Q are arranged such that their centres are on the X-axis and are separated by a large distance. The magnetic axes of P and Q are along X and Y-axes, respectively. At a point R, midway between their centres, if B is the magnitude of induction due to Q , then the magnitude of total induction at R due to the magnitude is

`sqrt(5) B`

`( sqrt(5))/( 2) B `

`B`

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