The force between two charges is 10 N in vacuum. If a dielectric of constant 5 is inserted, force becomes MCQ with Answer and Explanation

Explanation:
Polarized sunglasses use polarizing filters to block horizontally polarized glare reflected from surfaces (water, roads). LCD displays use liquid crystals to rotate polarization, controlling light transmission through polarizers. Memory tip: 'Polarization applications: glare reduction (sunglasses), display technology (LCDs), 3D movies'. This application question tests wave optics uses, frequently appearing in competitive exams. Always link physical principles to everyday technologies; competitive exams emphasize practical relevance of physics concepts, making abstract phenomena tangible through common devices.

Explanation:
g_pole > g_equator due to less centrifugal effect and Earth's oblateness. At centre g=0, weightless. So weight max at poles.

Explanation:
Sound Navigation And Ranging uses echo (reflection).