Why there is deflection in galvanometer when magnetic is approachin or withdraw

When the bar magnet is withdrawn from inside the coil, again an induced current is setup in the coil due to change of magnetic field through it. As a result galvanometer gives a deflection in the reverse direction

an ion is a charged atom or molecule. it is charged because the number of electrons do not equal the number of protons in the atom or molecule. an atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.

the answer is a. hope this .