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1. Electric Charges and Fields
normal
$(6\,\mu \,F)$ કેપેસિટરનો વોલ્ટેજ $10\ V$ થી $20\ V$ કરવા માટે કેટલું કાર્ય કરવું પડે?
A
$2 \times {10^{ - 4}}\ J$
B
$4 \times {10^{ - 4}}\ J$
C
$3 \times {10^{ - 4}}\ J$
D
$9 \times {10^{ - 4}}\ J$
Solution
${U_i} = \frac{1}{2}\,CV_1^2$;
${U_f} = \frac{1}{2}CV_2^2$
$\Delta U={{U}_{f}}-{{U}_{i}}=\frac{1}{2}C\,(V_{2}^{2}-V_{1}^{2})$$=\frac{1}{2}\times 6\times {{10}^{-6}}({{20}^{2}}-{{10}^{2}})$$=9\times {{10}^{-4}}\ J.$
Standard 12
Physics
