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Answer Text

`(NBA)/(R )``(sqrt(3) NBA)/(2R)``(NBA)/(sqrt(2)A)``(2NBA)/(R )`

Answer :

DSolution :

Initial flux through the coil, `phi_(Bi) = +NBA` <br> Final flux through the coil, `phi_(Bi) = +NBA` <br> When the coil is turned through `180^(@)` its flux reverses, the angle between magntic field and area vector is reversed. <br> `Delta phi_(B) = phi_(Bf) - phi_(Bi) = -NBA-(NBA) = -2NBA` <br> `Q = (Delta phi_(B))/(R ) = (2NBA)/(R )`