The fuse current (I) is proportional to the square root of the cross-sectional area. Since area is proportional to the square of the radius, doubling the radius increases I by √4 = 2, giving = 5 × 2¹.5 = 14.7 ...
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For four identical resistors in parallel, the effective resistance is: R/4 = 0.25 ⇒ R = 1Ω In series, total resistance is: R series= 4R = 4 × 1 = 4Ω Thus, the correct answer is (a) 4 Ω.
Resistance of a wire is given by R = ρ L/A . When stretched, L ′ = 1.5L and = A/(1.5)², so new resistance: R ′ = ρ 1.5L/A/(1.5)² = 2.25R To make R′ = 4R, solving gives fraction 1/6. ...
The second excited state of hydrogen atom corresponds to n = 3 and as per Bohr’s model the angular momentum of electron is 3h/2pi. Class 12 Physics NCERT Sample Paper Question Session 2024-2025.
When an intrinsic semiconductor is doped with a trivalent impurity (say aluminium), an additional acceptor energy level is formed slightly above the top of the valence band. As a result energy gap is reduced to a large extent. Class 12 ...