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Physics
An infinitesimally small bar magnet of dipole moment is pointing and moving with the speed v in the - direction. A small closed circular conducting loop of radius a and negligible self - inductance lies in the y - z plane with its center at x = 0, and its axis coinciding with the axis. Find the force opposing the motion of the magnet, if the resistance of the loop is R. Assume that the distance x of the magnet from the center of the loop is much greater than a.
Chemistry
The following electrochemical cell has been set up. Pt(1) ïFe³⁺, Fe²⁺ (a = 1) ïCe⁴⁺, Ce³⁺ (a = 1) ïPt(2) E^o (Fe³⁺, Fe²⁺) = 0.77 V : E^o (Ce⁴⁺ / Ce³⁺) = 1.61 V If an ammeter is connected between the two platinum electrodes, predict the direction of the flow of current. Will the current increase or decrease with time?
Mathematics
ABC is an isosceles triangle inscribed in a circle of radius r. If AB = AC and h is the altitude from A to BC then the triangle ABC has perimeter and area A = ................... also ............................