Current Electri...

A galvanometer having internal resistence 10 Ω requires 0.01 A for a full scale deflection. To convert this galvanometer to a voltmeter of full scale deflection at 120 V, we need to connect a resistance of

The neutral point on potentiometer's scale for two cells of emf 2.1 and E volt is observed at distances 40 cm and 56 cm respectively. The value of E is

A voltmeter has resistance of G ohms and range V volt. The value of resistance used in series to convert it into a voltmeter of range n V volts is

The current in the primary circuit of a potentiometer is 0.2 A. The specific resistance and cross-section of the potentiometer wire are 4 × 10^-7 Ω-m and 8 × 10^-7 m² espectively. The potential gradient will be equal to

A voltmeter of range 2 V and resistance 300Ω cannot be converted into ammeter of range

The deflection in a moving coil galvanometer is reduced to half when it is shunted with a 40 Ω coil. The resistance of the galvanometer is

In a potentiometer experiment the balancing with a cell is at length 240 cm. On shunting the cell with a resistance of 2 Ω, the balancing length becomes 120 cm.The internal resistance of the cell is

For measurement of potential difference, potentiometer is preferred in comparison to voltmeter because

The range of a voltmeter of resistance 500 Ω is 10 V. The resistance to be connected to convert it into an ammeter of range 10 A is

Three voltmeters A, B and C having resistances R, 1.5 R and 3R respectively are used in a circuit as shown. When a potential difference is applied between X and Y, the readings of the voltmeters are V₁ , V₂ and V₃ respectively. Then,