In which the following has the ability to generate action potential without any external stimuli ?

In which the following has the ability to generate action potential without any external stimuli ?
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In which the following has the ability to generate action potential without any external stimuli ? A. Sino ... C. Purkinje fibres D. All of the above
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The following are true about critical fusion frequency: a. it refers to the rate at which stimuli can be presented and still be perceived as separate stimuli b. it is dependent on visual acuity c. it is dependent on the spacing between neighbouring photoreceptors d. it depends on the time-resolving ability of the eye

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A cell of emf E and internal resistance r is connected in series with an external resistance nr. Than what will be the ratio of the terminal potential

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A cell which has an emf `1.5` V is connectedin series with an external resistance of `10Omega`. If the potential difference across the cell is `1.25`

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If E is the emf of a cell of internal resistance r and external resistance R, then potential difference across R is given as

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