Questions in Current Electricity

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	A nichrome wire 50 cm long and one square millimetre cross-section carries a current of 4A when connected to a 2V battery. The resistivity of nichrome wire in ohm metre is
	If an observer is moving with respect to a stationary electron, then he observes
	Calculate the amount of charge flowing in 2 minutes in a wire of resistance $10 \Omega$ when a potential difference of 20 V is applied between its ends
	If a wire of resistance R is melted and recasted to half of its length, then the new resistance of the wire will be
	The drift velocity does not depend upon
	There is a current of 40 ampere in a wire of $10^{-6}m^2$ area of cross-section. If the number of free electron per $m^3$ is $10^{29}$, then the drift velocity will be
	At room temperature, copper has free electron density of $8.4 \times 10^{28}$ per $m^3$. The copper conductor has a cross-section of $10{–6}m^2 and carries a current of $5.4 A$. The electron drift velocity in copper is
	The resistance of a 5 cm long wire is 10 ohm. It is uniformly stretched so that its length becomes 20 cm. The resistance of the wire is
	The resistance of an incandescent lamp is
	In the figure a carbon resistor has bands of different colours on its body as mentioned in the figure. The value of the resistance is