উত্তর সিলেক্ট করলে সঠিক ও ভুল দেখাবে।
ব্যাখ্যা ও সঠিক সমাধান
উত্তর:
8:9
g_h = g(R / (R+h))² = g(R / (R+R))² = g/4. g_d = g(1 - d/R) = g(1 - R/R) = 0. (Note: The question implies d=R/2 or similar context from options, but based on standard ratio g_h/g_d for h=R and d=R/2: g_h/g_d = (g/4) / (g/2) = 1/2. Re-evaluating based on provided solution image: g_h/g_d = (R/(R+h))² / (1-d/R) = (2/3)² / (1/2) = 8/9 where h=R/2, d=R/2)