Questions in Current Electricity

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	The resistance of a galvanometer is 90 ohms. If only 10 percent of the main current may flow through the galvanometer, in which way and of what value, a resistor is to be used
	Two cells when connected in series are balanced on 8m on a potentiometer. If the cells are connected with polarities of one of the cell is reversed, they balance on 2m. The ratio of e.m.f.'s of the two cells is
	A voltmeter has a resistance of Gohms and range Vvolts. The value of resistance used in series to convert it into a voltmeter of range nV volts is
	Which of the following statement is wrong
	In the diagram shown, the reading of voltmeter is 20 V and that of ammeter is 4 A. The value of R should be (Consider given ammeter and voltmeter are not ideal)
	A moving coil galvanometer has a resistance of $50\,\Omega $and gives full scale deflection for 10 mA. How could it be converted into an ammeter with a full scale deflection for 1A
	The current flowing through a coil of resistance 900 ohms is to be reduced by 90%. What value of shunt should be connected across the coil
	A galvanometer of resistance $25\,\Omega $ gives full scale deflection for a current of 10 milliampere, is to be changed into a voltmeter of range 100 V by connecting a resistance of ‘R’ in series with galvanometer. The value of resistance R in $\Omega $ is
	In a potentiometer circuit there is a cell of e.m.f.2 volt, a resistance of 5 ohm and a wire of uniform thickness of length 1000 cm and resistance 15 ohm. The potential gradient in the wire is
	The resistance of a galvanometer is 25 ohm and it requires $50\,\mu A$ for full deflection. The value of the shunt resistance required to convert it into an ammeter of 5 amp is

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