1.

Which of these formulae is correct to find the gradient of the element ‘k’?

A. ∇Φk = \(\frac{1}{V_k}(\Sigma_{n\leftarrow f<k}\Phi_n\vec{S_n}-\Sigma_{n\leftarrow f>k} \Phi_n\vec{S_n})\)
B. ∇Φk = \(\frac{1}{V_k}(-\Sigma_{n\leftarrow f}\Phi_n \vec{S_n})\)
C. ∇Φk = \(\frac{1}{V_k}(\Sigma_{n\leftarrow f}\Phi_n \vec{S_n})\)
D. ∇Φk = \(\frac{1}{V_k}(- \Sigma_{n\leftarrow f<k}\Phi_n\vec{S_n}+\Sigma_{n\leftarrow f>k} \Phi_n\vec{S_n})\)
Answer» E.


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