Related InterviewSolutions

• A galvanometer with a coil of resistance `10.0Omega` shows full scale deflection for a current of 50mA. How will you convert the galvanometer into (i). An ammeter of range 0 to 0.5 A and (ii). A voltmeter of range 0 to 5V?
• A galvanometer of resistanece `40Omega` gives a deflection of 5 divisions per mA. There are 50 divisions on the scale. Calculate the maximum current that can pass through it when a shunt resistance of `2Omega` is connected.
• A galvanometer has a resistance of `100Omega`. A difference of potential of 1.0 V between its terminals gives a full scale deflection. Calculate the shunt resistance which will enable the instrument to read upto 2A.
• When a galvanometer having 20 divisions scale and `50Omega` resistance is connected in series to a cell of emf `1.5V` through a resistance of `100Omega`, its shows full scale deflection. Find the figure of merit of the galvanometer.
• A certain length of a uniform wire of resistance `12Omega` is bent into a circle and two points, a quarter of circumference apart, are connected to a battery of emf 4 V and internal resistance `1Omega`. Find the current in the different parts of the circuit.
• A potentiometer is being used to determine the internal resistance of a primary cell. The balance point for the cell in an open circuit is at 76.3 cm. when the cell sends a current in a resistor of `9.5Omega`, the balance point shifts to 64.8cm. Find the internal resistance of the cell.
• With a certain cell, the balance point is obtained at 60 cm from the zero end of the potentiometer wire. With another cell whose emf differs from that of the first cell by 0.1 V, the balance point is obtained at 50 cm mark. Calculate the emf of the two cells.
• With a cell of emf 1.5 V, the balance point is obtained at a distance of 60 cm from one end of the potential wire. Calculate the potential difference between two ends of the potentiomter wire if its total length is 100 cm.
• A galvanometer has a resistance of `15.0Omega` and the meter shows full scale deflection for a current of 2.0 mA. How will you convert this meter into (i) an ammeter of range 0-5.0A and (ii) a voltmeter of range 0 to 15.0V? Also determine the resistance of the meter in each case.
• A galvanometer has an internal resistance `1.0Omega`. It given maximum deflection for a current of 50 mA. Show how this instrument can be converted into (i) a voltmeter with a maximum reading of 2.5 V and (ii) an ammeter with a maximum reading of 2.5 A