question_answer

  A positively charged particle (alpha-particle) projected towards west is deflected towards north by a magnetic field. What is the direction of magnetic field?                                                              [NCERT]

Answer:

                  (i) A current can be induced in a coil when a magnet is moved relative to the fixed coil. (ii) A current can also be induced in a given coil when it is moved relative to a fixed magnet. (ii) Current can also be induced in the coil by placing it close to another coil carrying a changing current.