solve for B only!! Find the mass of a thin wire lying along the curve ( r(t)=sqrt{2} t i+sqrt{5} t j+left(4-t^{2} ight) k, 0 leq

solve for B only!! Find the mass of a thin wire lying along the curve \( r(t)=\sqrt{2} t i+\sqrt{5} t j+\left(4-t^{2}\right) k, 0 \leq t \leq 1 \), if the density is (a) \( \delta=7 t \) and (b) \( \delta=1 \). 2 answers