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A capacitor is charged using an external battery with a resistance x in series. The dashed line showns the variation of In I with respect to time. If the resistance is changed to 2x, the new graph will be A. PB. QC. RD. S |
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Answer» Correct Answer - B b. The current in RC circuit is given by `I = I_0e^(-t//RC)` or `1nI = 1nI_0 - t/(RC) = (-t)/(RC) + 1NI_0` `=(-t/(RC))+1n(E_0)/R` On comparing with `y = mx + C`, we get Intercept `= 1n (E_0)/R and slope = -1/(RC)` When R is changed to 2R, then slope decreases in magnitude. New graph is Q. |
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