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  1. An electron in potentiometer experiences a force 2.4×10⁻¹⁹N. The length of potentiometer
  2. An electron moving in a uniform magnetic field of induction of intensity B,
  3. On a frictionless surface, a block of mass M moving at speed v collides elastically
  4. Two balls of mass m₁ and m₂ are separated from each other by powder charge
  5. Water flows through a pipe. The area of cross-section at one place A₁=10 cm²,