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Two co-axial hollow cylinders of radius ...

Two co-axial hollow cylinders of radius a and 2a having current I and `3I/2` in opposite directions respectively as shown in the figure. The ratio of the magnitude of magnetic field at the point P and point Q will be `(OP= 3a/2 and OQ=5a/2)`

A

`4/5`

B

`10/3`

C

`5/`3`

D

`4/3`

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