odp D. 40%
P = 4πR²
R₁ = 140%R = 1,4 R
P₁ = 4π (1,4 R)² = 4π ·1,96 R² = 196% · 4πR² = 196% P
przy zwiększeniu promienia kuli o 40 % pole wzroslo o 96%
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odp D. 40%
P = 4πR²
R₁ = 140%R = 1,4 R
P₁ = 4π (1,4 R)² = 4π ·1,96 R² = 196% · 4πR² = 196% P
przy zwiększeniu promienia kuli o 40 % pole wzroslo o 96%