Questions in Current Electricity

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An ammeter and a voltmeter of resistance R are connected in series to an electric cell of negligible internal resistance. Their readings are A and V respectively. If another resistance R is connected in parallel with the voltmeter
A wire of length 100 cm is connected to a cell of emf 2 V and negligible internal resistance. The resistance of the wire is 3 $\Omega$. The additional resistance required to produce a potential drop of 1 milli volt per cm is
A galvanometer of resistance 20 $\Omega$ is to be converted into an ammeter of range 1 A. If a current of 1 mA produces full scale deflection, the shunt required for the purpose is
There are three voltmeters of the same range but of resistances $10000\,\Omega $, $8000\,\Omega $ and $4000\,\Omega $ respectively. The best voltmeter among these is the one whose resistance is
If an ammeter is to be used in place of a voltmeter then we must connect with the ammeter a
A 10 m long wire of 20$\Omega$ resistance is connected with a battery of 3 volte.m.f. (negligible internal resistance) and a 10 $\Omega$ resistance is joined to it is series. Potential gradient along wire in volt per meter is
A potentiometer has uniform potential gradient across it. Two cells connected in series (i) to support each other and (ii) to oppose each other are balanced over 6m and 2m respectively on the potentiometer wire. The e.m.f.’s of the cells are in the ratio of
The material of wire of potentiometer is
To convert a galvanometer into a voltmeter, one should connect a
To convert a 800 mV range milli voltmeter of resistance 40 $\Omega$ into a galvanometer of 100 mA range, the resistance to be connected as shunt is

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