(i)A metallic coin is given a positive charge . Does the mass (a) increase measurably,(b) increase by an amount too small to measure directly,(c) remain unchanged , (d) decrease by an amount too small to measure directly , or (e) decrease measurably? (ii) Now the coin is given a negative charge. what happens to its mass?

Asquare 1m x 1m plate is shown below. all four of its edges are kept at 0 co. at t=0the temperature distribution is given by: y xtsins n75)=.a) using separation of variables determine the temperature distribution t(x,y,t)along the plate at any time t.b) discretize the heat conduction equation +=22222 txtusing a second-order centered difference scheme for the two second derivatives and a first-order forward euler scheme for the first derivative. using von neumann stability analysis, determine the stability criterion for the proposed discretization scheme in terms of , hand t. solve for the maximum allowable time step tmax