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A wheatstone bridge is used to determine the value of unknown resistance X by adjusting the variable resistance Y as shown in the figure. For the most precise measurement of X, the resistance P and Q:

(1) should be very large and unequal

(2) do not play any significant role

(3) should be approximately equal to 2X

(4) should be approximately equal and are small

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(4) should be approximately equal and are small

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