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  1. The electrons are emitted in the photoelectric effect from a metal surface
  2. A wire in the form of a circular loop of one turn, carrying a current, produces
  3. The difference in the lengths of a mean solar day and a sidereal day is about
  4. In an NPN transistor the collector current is 24 mA. If 80% of the electrons
  5. The displacement of a particle along the x-axis is given by x = a sin² ?t