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What are value of phi(1), phi(2) and r t...

What are value of `phi_(1), phi_(2)` and r to find out magnetic field at P in the following cases ?

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(i) Comparing with general expression, `phi_(1) = 45^(@), phi_(2) = 30^(@) and r = a`
(ii) Comparing with general expression, `phi_(1) = 60^(@), phi_(2) = -45^(@)` (as the angle is in opposite seense to that considered in standard case), `r = a`
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