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in Physics
Answer: g\' = g(R/(R+h))² ≈ g(1 - 2h/R) for h << R
Answer: A transformer works on the principle of mutual electromagnetic induction between primary and secondary coils.
Answer: Ampere (A) is the SI base unit of electric current.
Answer: Torque = dL/dt, where L is angular momentum. This is analogous to F = dp/dt.
Answer: Angular momentum is conserved when the net external torque acting on the system is zero.
Answer: The moment of inertia of a solid sphere about its diameter is 2/5 MR²
Answer: t = √(2h/g) = √(90/10) = 3 s. Range = uₓt = 20 × 3 = 60 m
Answer: A superconductor has exactly zero electrical resistance below its critical temperature.
Answer: Inside a long solenoid, the magnetic field is uniform and parallel to the axis.
Answer: KE = p²/2m → p = √(2mKE). If KE doubles, p becomes √2 times the original.
Answer: Red light has the longest wavelength (~700 nm) in the visible spectrum.
Answer: Kinetic friction is always less than static friction for the same pair of surfaces.
Answer: When an object is at C of a concave mirror, the image is also formed at C, real and inverted, same size.
Answer: Each part has resistance R/n. In parallel: 1/Req = n/(R/n) = n²/R → Req = R/n²
Answer: The standard frequency of AC power supply in India is 50 Hz.
Answer: Energy stored in a capacitor = ½CV² = ½Q²/C = ½QV
Answer: λ = h/mv, so the de Broglie wavelength is inversely proportional to the velocity (momentum) of the particle.
Answer: Destructive interference occurs when path difference = (n + ½)λ, where the waves are out of phase.
Answer: Electric potential at a point is defined as the work done in bringing a unit positive charge from infinity to that point.
Answer: A charged particle entering a magnetic field perpendicularly experiences a force perpendicular to both v and B, causing circular motion.