A letter'A' is constructed of a uniform wire with resistance 1.0Ω per cm , The sides of the letter are 20 cm and the cross piece in the middle is 10 cm long. The apex angle is 60. The resist

Question

A letter'A' is constructed of a uniform wire with resistance 1.0Ω per cm , The sides of the letter are 20 cm and the cross piece in the middle is 10 cm long. The apex angle is 60. The resistance between the ends of the legs is close to:

TestHub · Accepted Answer

For ADE R ′ 1 ​ = 2 x 1 ​ + 10 1 ​ or R ′ = 10 + 2 x 20 x ​ R BC ​ = 10 + 2 x 20 x ​ + 20 − x + 20 − x … (i) or 10 + 2 x 20 x ​ + 40 = 2 x Solving we get x = 10Ω Putting the value of x = 10Ω in equation (i) We get R BC ​ = 10 + 2 × 10 20 × 10 ​ + 20 − 10 + 20 − 10 = 3 80 ​ = 26.7Ω

Physics - Current Electricity Question with Solution | TestHub

Options:

Doubts & Discussion