81)Which among the following components helps in preventing damages due to over loading?
82)A conductor of length I is moving with a speed of v in the direction perpendicular to the direction of the magnetic field of induction B. The motional EMF is given by
83)In which among the following, the electrical energy is converted into mechanical energy?
84)If △∅/△t is the rate of change of flux and I is the current, then the electric power is
85)If Io and Vo are the peak values of AC and AC-EMF for an AC generator, then their r.m.s. values respectively are
86)When water freezes, its volume
87)The reverse process of evaporation is
88)Which one among the following is an example of condensation?
89)If u, v and f are the object distance, image distance and focal length respectively, then the mirror formula is given by
90)If an object is placed between the focus (F) and the centre of curvature (Q on the principal axis of a concave mirror, then the position of the image is