Questions in Current Electricity

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	A potentiometer having the potential gradient of 2 mV/cm is used to measure the difference of potential across a resistance of 10 ohm. If a length of 50 cm of the potentiometer wire is required to get the null point, the current passing through the 10 ohm resistor is (in mA)
	AB is a potentiometer wire of length 100 cm and its resistance is 10 ohms. It is connected in series with a resistance R = 40 ohms and a battery of e.m.f. 2 V and negligible internal resistance. If a source of unknown e.m.f.E is balanced by 40 cm length of the potentiometer wire, the value of E is
	An ammeter gives full deflection when a current of 2 amp. flows through it. The resistance of ammeter is 12 ohms. If the same ammeter is to be used for measuring a maximum current of 5 amp., then the ammeter must be connected with a resistance of
	In a circuit 5 percent of total current passes through a galvanometer. If resistance of the galvanometer is G then value of the shunt is
	A voltmeter having resistance of 50 × 103ohm is used to measure the voltage in a circuit. To increase the range of measurement 3 times the additional series resistance required is
	In a potentiometer experiment two cells of e.m.f.E1 and E2 are used in series and in conjunction and the balancing length is found to be 58 cm of the wire. If the polarity of E2 is reversed, then the balancing length becomes 29 cm. The ratio $\frac{{{E_1}}}{{{E_2}}}$ of the e.m.f. of the two cells is
	A milliammeter of range 10 mA has a coil of resistance 1 $\Omega$. To use it as voltmeter of range 10 volt, the resistance that must be connected in series with it, will be
	A voltmeter has a range 0-V with a series resistance R. With a series resistance 2R, the range is 0-V'. The correct relation between V and V' is
	The measurement of voltmeter in the following circuit is
	A 36 $\Omega$ galvanometer is shunted by resistance of 4$\Omega$. The percentage of the total current, which passes through the galvanometer is

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