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Figure (a) shows a ring of mass m and fi...

Figure (a) shows a ring of mass m and figure (b) shows half portion of the same ring . Gravitational field at point P in figure (b) is `I_(2)` in magnitude and makes an angle `phi` with line . AB. Gravitational field at point P in figure (a) is `I_(1)` in magnitude . The ratio of `(I_(1))/(2 I_(2))` is

A

sec `phi`

B

cos `phi`

C

tan `phi`

D

sin `phi`

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The correct Answer is:
B
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