A student measures the terminal potential difference (V) of a cell (of emf and internal resistance r) as a function of the current (I) flowing through it. The slope and intercept of the graph between V and I, then respectively, equal

$straight epsilon space and space minus straight r$
$negative straight r space and space straight epsilon$
$straight r space and space minus straight epsilon$
$negative straight epsilon space and space straight r$

Solution

negative straight r space and space straight epsilon

According to Ohm's law
$dV over dI space equals space minus straight r and space straight V space equals straight epsilon space if space straight I space equals space 0 space left square bracket space As space straight V space plus Ir space equals space straight epsilon right square bracket therefore comma space Slope space of space the space graph space equals space minus space and space intercept space equals straight epsilon$

Some More Questions From Moving Charges And Magnetism Chapter

Two moving coil meters, M₁ and M₂ have the following particulars:
R₁ = 10 Ω N₁ = 30,
A₁ = 3.6 x 10^–3 m², B₁ = 0.25 T
R₂ = 14 Ω; N₂ = 42,
A₂ = 1.8 x 10^–3 m², B₂ = 0.50 T
(The spring constants k are identical for the two meters).
Determine the ratio of (a) current sensitivity and (b) voltage sensitivity of M₂ and M_1.

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Moving Charges And Magnetism

Some More Questions From Moving Charges And Magnetism Chapter

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