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  1. A capacitor of 2.5 μF is charged through a resistor of 4 MΩ. In how much time
  2. A proton and helium nucleus are shot into a magnetic field at right angles to the field
  3. A voltmeter of range 2 V and resistance 300Ω cannot be converted into ammeter
  4. The wave described by y = 0.25 sin (10 2πx – 2πt), where x and y are in meters
  5. Radioactivity of a sample at T₁ time is R₁ and at time T₂ is R₂. If half-life