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A graph is plotted taking p.d. along y-axis and electric current along x-axis. Name the physical quantity that represents the slope of this graph (Fig.).
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Name the following substances:
(i) Showing low resistivity,
(ii) Showing very high resistivity,
(iii) Showing moderate resistivity.
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What potential difference is needed to drive a current o f 1 A through a 5 Ω resistor?
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What is the equivalent resistance between A and B in the given circuit (Fig?)
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How will you oonnect five resistors, each of the value one ohm, to obtain an equivalent resistance of 0.2 `Omega`
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You have three resistors of values 2 `Omega`, 3 `Omega`, and 5 `Omega`. How will you join them so that the total resistance is less than 2 `Omega`?
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Calculate the equivalent resistance of the following combination of resistor r1, r2, r3, and r4
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What information about the nature of image is real or virtual, do you get from the sign of magnification + or -?
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If the magnification produced by a lens is - 0.5, the correct statement is ______.
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The focal length of a convex lens is 25 cm. At what distance from the optical centre of the lens an object be placed to obtain a virtual image of twice the size?
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