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In the circuit shown, a four −wire potentiometer is made of a 400 cm long wire, which extends between A and B. The resistance per unit length of the potentiometer wire is r = 0.01 / cm. If an ideal voltmeter is connected as shown with jockey J at 50 cm from end A, the expected reading of the voltmeter will be

(a)

0.75 V

(b)

0.50 V

(c)

0.20 V

(d)

0.25 V


Question ID - 51182 | Toppr Answer

In the circuit shown, a four −wire potentiometer is made of a 400 cm long wire, which extends between A and B. The resistance per unit length of the potentiometer wire is r = 0.01 / cm. If an ideal voltmeter is connected as shown with jockey J at 50 cm from end A, the expected reading of the voltmeter will be

(a)

0.75 V

(b)

0.50 V

(c)

0.20 V

(d)

0.25 V

1 Answer - 5876 Votes

3537

Answer Key : (d) -

Resistance of potentiometer wire, Rp = 400 × 0.01   

                                                                        = 4

⇒ I =  = 0.5 A

⇒ Reading of voltmeter = I RAJ

                                               = 0.5 × 50 × 0.01

                                               = 0.25 V



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