Physics-
A spherical shell, made of material of electrical conductivity
has + - thickness t = 2 mm and radius r = 10 cm. In an arrangement, its inside surface is kept at a lower potential than its outside surface The resistance offered by the shell is equal to
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Physics-General
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In the shown wire frame, each side of a square (the smallest square) has a resistance R. The equivalent resistance of the circuit between the points A and B is :


In the shown wire frame, each side of a square (the smallest square) has a resistance R. The equivalent resistance of the circuit between the points A and B is :

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From the figure


Two circular rings of identical radii and resistance of 36Weach are placed in such a way that they cross each other’s centre C1 and C2 as shown in figure. Conducting joints are made at intersection points A and B of the rings. An ideal cell of emf 20 volts is connected across AB. The power delivered by cell is

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From the figure


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A cell of emf E having an internal resistance 'r ' is connected to an external resistance R. The potential difference ' V ' across the resistance R varies with R as shown by the curve:

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In a practical wheat stone bridge circuit as shown, when one more resistance of 100 W is connected is parallel with unknown resistance ' x ', then ratio
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wheat stone bridge is in balanced condition


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\ current drawn from the battery
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\ current drawn from the battery
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find the value of x in given figure.

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physics-General
Current is maximum when resistance in the circuit is minimum. i.e. when S1 ,S3 ,S5 are closed because then all resistances will be short circuited 