14.4\(\Omega\)
28.8\(\Omega\)
144\(\Omega\)
288\(\Omega\)
2880\(\Omega\)
Correct answer is B
Heat energy = Electrical energy 6 x 105 = \(\frac{V^2}{R}\)t R = \(\frac{240 \times 240 \times 5 \times 60}{6 \times 105}\) = 28.8\(\Omega\)
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