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
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 | SaraNextGen Top 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
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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
|
|||
|
(a) |
0.75 V |
(b) |
0.50 V |
|
(c) |
0.20 V |
(d) |
0.25 V |
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