JEE Main 2013 Physics 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:
Answer: (4)
Solution
The cross-piece (10 cm) joins the midpoints of the 20 cm sides (with a 60° apex, the upper triangle is equilateral of side 10). From one foot: lower half of a leg 10 Ω, then between the
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