6. In a standard lecture demonstration, a loop of wire, with radius a and resistance R, levitates over a magnetic-field producing coil. loop of wire i = i, cos ot Assuming the B field is uniform and vertical in the vicinity of the loop, and has mag- nitude given by |B| = Bo cos wt, find the current in the loop, ignoring self-inductance. Find the magnitude of the magnetic force. Can you explain why the loop stays up? 7. In the preceding problems it was stated that self-inductance was to be ignored. How would the solutions be modified if self-inductance were not ignored?

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Applications Of Reflection Of Light

When a light ray (termed as the incident ray) hits a surface and bounces back (forms a reflected ray), the process of reflection of light has taken place.

Sign Convention for Mirrors

A mirror is made of glass that is coated with a metal amalgam on one side due to which the light ray incident on the surface undergoes reflection and not refraction.