Circle the best answer A Wheatstone bridge is used to determine resistance and e

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Circle the best answer A Wheatstone bridge is used to determine resistance and emf of unknown resistors and batteries. gives a null condition when no current is drawn from the battery. can be used to determine the resistance of an unknown resistor from the ratio of known resistors is also known as a potentiometer when a slide wire is used for a branch carries the same current in two parallel branches when it is balance In a slide wire bridge, the wire represents two resistors of the Wheatstone bridge circuit. a greater relative error arises when the balance occurs near the middle of the wire. a greater sensitivity is attained when the galvanometer is placed in series with a resister the error in the unknown resistor arises solely from the uncertainty of the known resistor. balancing the bridge is more difficult than in a Wheatstone bridge using four resistors. In a slide wire bridge, the most accurate determination of the unknown resistance is obtained when the sliding contact on the slide wire balances the bridge near the point where L_2 = 0 cm and L_3 = 100 cm. near the point where L_2 = 100 cm and L_3 = 0 cm. near the point where L_2 = L_3 = 50 cm. the same accuracy is determined no matter where the bridge is balanced, as long as it is balanced.

Explanation / Answer

a) Wheat stone Bridge --------------3

b) Slide wire Bridge --------------------1,4

c) Slide wire Bridge ------3 most accurate

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