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The magnetic field due to a point charge moving with velocity vis given as B(r) as shown in equation-1.The magnetic field due to moving point charge is given by the following expression:vec(B)(( vec(r))=(mu_(0))/(4pi)quad(q( vec(v))xx( hat(r)))/(r^(2)):}Here,vec(B)( vec(r))= magnetic fieldmu_(0)= permeability of free sparevec(v)= velority of point charge.hat(r)= unit vector from point of location of point charge to the point where magnetic field is to be calculated.r= distance between loration of point charge to the point where magnetic field is to bo calculated.Part B :{:[{:[=>quadr_(1)=x_(1)],[ hat(r)_(1)= hat(i)]:}],[ vec(v)=v hat(k)", unit vector "]:}" Here, " vec(r)= vec(r)_(1)Substituting t ... See the full answer