A resistance of 5 Ω is connected across one gap of a meter bridge (wire length 100 cm) and an unknown resistance, greater than 5 Ω , across the other gap. On interchanging the resistances, the balance

Question

A resistance of 5 Ω is connected across one gap of a meter bridge (wire length 100 cm) and an unknown resistance, greater than 5 Ω , across the other gap. On interchanging the resistances, the balance point shifts by 20 cm. Neglecting any corrections, the unknown resistance is

TestHub · Accepted Answer

R 5 ​ = 100 − x x ​ 5 R ​ = 80 − x x + 20 ​ From the first equation, x = 5 + R 500 ​ Substituting in the second and solving: 60 R = 450 R = 7.5 Ω

Physics - Current Electricity Question with Solution | TestHub

Options:

Doubts & Discussion