We know that when electricity flows through a coil it produces a magnetic field. All shaving razor blades have a residual magnetism. Make a coil with 40-50 turns of insulated copper wire and hang a blade in its center. On passing current the coil will become an electromagnet and the blade will be oriented towards its field. On changing the direction of current the blade will turn the other way.
This work was supported by IUCAA and Tata Trust. This film was made by Ashok Rupner TATA Trust: Education is one of the key focus areas for Tata Trusts, aiming towards enabling access of quality education to the underprivileged population in India. To facilitate quality in teaching and learning of Science education through workshops, capacity building and resource creation, Tata Trusts have been supporting Muktangan Vigyan Shodhika (MVS), IUCAA’s Children’s Science Centre, since inception. To know more about other initiatives of Tata Trusts, please visit