Archimedes' principle: buoyant force = weight of displaced fluid. Law of floatation: floating body displaces fluid equal to its own weight. Archimedes discovered it. Pascal gave pressure law.
Explanation:
Resonance: X_L = X_C ⇒ they cancel ⇒ Z = R (minimum). Current maximum at resonance. Memory tip: 'Series resonance: Z_min = R; parallel: Z_max'. AC circuit concept frequently tested in competitive exams.
Explanation:
Nichrome (alloy of nickel, chromium) has high resistivity and high melting point, doesn't oxidize easily at high temperature. Copper has low resistivity, not suitable for heating element.
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