rupee vs dollar

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hi there,,, in the recent few days we have seen that the rupee has fallen in coparison to the US $ well i dont know why this fluctation takes place in the value of currencies,now a days dollar has become stronger as compared to indian rupee it 52rs= 1$.dollar is in a strong position .well can you people tell me the reason for this fluctation in rates and also the effect of such flutuations,,,,,,,,