MEDIUM
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IMPORTANT
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A battery of emf E and internal resistance r is connected across a resistance R. Resistance R can be adjusted to any zero. A graph is plotted between the current passing through the resistance (I) and potential difference (V) across it. Select the correct alternatives.

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Important Questions on Current Electricity

MEDIUM
Physics
IMPORTANT
Which of the following statements are correct?
HARD
Physics
IMPORTANT

A cylindrical solid rod of length L and radius a is connected across a source of emf V and negligible internal resistance as shown in the figure. The resistivity of the rod at point P at a distance x from the left end is given by ρ=bx (where b is a positive constant). The electric field at point P is nVL2x. The value of n is

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HARD
Physics
IMPORTANT

There are six parallel plates of equal area A are arranged as shown in figure (d<<A). The equivalent capacitance between points 2 and 5, is αϵ0 A d. Then find the value of α

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HARD
Physics
IMPORTANT

In the arrangement shown in figure, find the potential difference VB-VA (in V ). (Take V0=55 V)

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MEDIUM
Physics
IMPORTANT

A coil of self inductance L=1 H & resistance r=4 Ω is connected in series with a variable resistance R and an a.c. source with ω=3 rad s-1 as shown in the figure. What should be the value of R (in Ω) so that the rate of heat loss through R is maximum?

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