41.
Four wires of same material, the same cross-sectional area and the same length when connected in parallel give a resistance of 0.25 Ω. If the same four wires are connected is series the effective resistance will be

43.
Two resistors are said to be connected in series when

46.
Two copper conductors have equal length. The cross-sectional area of one conductor is four times that of the other. If the conductor having smaller cross-sectional area has a resistance of 40 ohms the resistance of other conductor will be

47.
The condition for the validity under Ohm’s law is that

48.
The condition for the validity under Ohm's law is that

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