Current Electri...

A voltmeter having resistance of 50 × 10³ ohm 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.\'s E₁ and E₂are used in series and in conjunction and the balancing length is found to be 58 cm of the wire. If the polarity of E₂is reversed, then the balancing length becomes 29 cm. The ratio E₁/E₂ of the e.m.f. of the two cells is

A milliammeter of range 10 mA has a coil of resistance 1 Ω. To use it as voltmeter of range 10 volt, the resistance that must be connected in series with it, will be

A 36 Ω galvanometer is shunted by resistance of 4 Ω. The percentage of the total current, which passes through the galvanometer is

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 e.m.f 2 V and negligible internal resistance. The resistance of the wire is 3 Ω. The additional resistance required to produce a potential drop of 1 milli volt per cm is

A galvanometer of resistance 20 Ω 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 Ω, 8000 Ω and 4000 Ω respectively. The best voltmeter among these is the one whose resistance is

A voltmeter essentially consists of

A 100 ohm galvanometer gives full scale deflection at 10 mA. How much shunt is required to read 100 mA?