Questions in Current Electricity

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	A galvanometer, having a resistance of 50 $\Omega$ gives a full scale deflection for a current of 0.05 A. The length in meter of a resistance wire of area of cross-section $2.97 \times 10^{–2} cm^2$ that can be used to convert the galvanometer into an ammeter which can read a maximum of 5 A current is (Specific resistance of the wire = $5 \times {10^{ - 7}} \Omega m$)
	An ammeter reads upto 1 ampere. Its internal resistance is 0.81 ohm. To increase the range to 10 A the value of the required shunt is
	The length of a wire of a potentiometer is 100 cm, and the emf of its standard cell is E volt. It is employed to measure the e.m.f of a battery whose internal resistance is 0.5 $\Omega$. If the balance point is obtained at l = 30 cm from the positive end, the e.m.f. of the battery is
	Resistance of 100 cm long potentiometer wire is 10$\Omega$, it is connected to a battery (2 volt) and a resistance R in series. A source of 10 mV gives null point at 40 cm length, then external resistance R is
	The e.m.f. of a standard cell balances across 150 cm length of a wire of potentiometer. When a resistance of $2\,\Omega $ is connected as a shunt with the cell, the balance point is obtained at $100\,cm$. The internal resistance of the cell is
	What is the reading of voltmeter in the following figure
	The current flowing in a coil of resistance 90 $\Omega$ is to be reduced by 90%. What value of resistance should be connected in parallel with it
	The maximum current that can be measured by a galvanometer of resistance 40 $\Omega$ is 10 mA. It is converted into a voltmeter that can read upto 50 V. The resistance to be connected in series with the galvanometer is ... (in ohm)
	For the post office box arrangement to determine the value of unknown resistance the unknown resistance should be connected between
	A galvanometer of 50 ohm resistance has 25 divisions. A current of $4 \times 10^{–4}$ ampere gives a deflection of one division. To convert this galvanometer into a voltmeter having a range of 25 volts, it should be connected with a resistance of

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