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  1. Bar magnets should be stored in pairs such that like poles are on the same side
  2. A pair of bar magnets should be separated by a wooden piece
  3. The ends of bar magnets should be connected by soft iron pieces
  4. They should be stored in wooden box
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1 Answers

Option 2 : A pair of bar magnets should be separated by a wooden piece

Concept:

Magnet:

  • A magnet is an object that has a magnetic field.
  • A magnet attracts or repels other items.
  • Magnets like a pole or magnetic materials are attracted and opposite poles are repelled.
  • The magnetic field strength of any bar magnet is maximum at the poles.
  • The field strength of a bar magnet is shown in the figure.

 Precautions with Magnets:

  • Magnets lose magnetism when they are heated, hammered, or dropped from some height.
  • Magnets become weak if they are not stored properly.
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Related Questions

Consider the following solution to the producer-consumer synchronization problem. The shared buffer size is . Three semaphores empty, full and mutex are defined with respective initial values of 0, and 1. Semaphore empty denotes the number of available slots in the buffer, for the consumer to read from. Semaphore denotes the number of available slots in the buffer, for the producer to write to. The placeholder variables, denoted by P, Q, R, and S, in the code below can be assigned either empty or full. The valid semaphore operations are: wait ( ) and signal ( ). Producer: Consumer: do {         wait (P) ;         wait (mutex) ;         //Add item to buffer         signal (mutex) ;         signal (Q) ; } while (1) ; do {          wait (R) ;          wait (mutex) ;          //Consume item from buffer          signal (mutex) ;          signal (S) ; } while (1) ;   Which one of the following assignments to P, Q, R and S will yield the correct solution?
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