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  1. Water flows through a pipe. The area of cross-section at one place A₁=10 cm²,
  2. Light of frequency 8×10¹⁵ Hz is incident on a substance of photoelectric work
  3. A student measures the terminal potential difference (V) of a cell
  4. A tangent galvanometer has a coil of 50 turns and a radius of 20 cm. The horizontal
  5. Cathode rays are produced when the pressure is of the order of