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Moving Charges and Magnetism a 210 mA c 420 mA 92 In the given circuit a galvanometer with a resistance of 70 2 is converted to an ammeter by a shunt resistance of 0 05 2 total current measured by this device b 155 mA d 75 mA 0 05 2 70 52 is a 0 88 A b 0 77 A c 0 55 A d 0 99 A 93 A galvanometer having a resistance of 50 2 gives a full scale deflection for a current of 0 05 A The length in metres of a resistance wire of area of cross section 3 x 10 cm 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 p 5 x 1022m a 9 b 6 c 3 d 1 5 96 A voltmeter which can measure 2V is constructed by using a galvanometer of resistance 122 and that produces maximum 94 The conversion of a moving coil galvanometer into a voltmeter is done by a introducing a resistance of large value in series b introducing a resistance of small value in parallel c introducing a resistance of large value in parallel d introducing a resistance of small value in series 95 A galvanometer of resistance 10 2 gives full scale deflection when 1 mA current passes through it The resistance required to convert it into a voltmeter reading upto 2 5 V is a 24 9 2 b 249 2 c 2490 2 d 24900 2 R 91 deflection for the current of 2 mA then the resistance Ris a 888 92 c 898 2 97 The value of current in the given circuit if the ammeter is a galvanometer with a resistance RG 50 92 is b 988 2 d 999 2 a 0 048 A c 0 061 A 2 V 5 V b 0 023 A d 0 094 A 98 A galvanometer coil has a resistance of 15 2 and the metre shows full scale deflection for a current of 4 mA To convert the meter into a voltmeter of range 0 to 18 V the required resistance is a 5885 2 in series c 5885 2 in parallel b 44852 in series d 4485 92 in parallel 99 A galvanometer of resistance 50 2 is connected to a battery of 3 V along with a resistance of 2950 2 in series A full scale deflection of 30 divisions is obtained in the galvanometer In order to reduce this deflection to 20 divisions the resistance in series should be a 6050 2 c 5050 2 b 4450 92 d 5550 2 100 The range of voltmeter of resistance 300 2 is 5 V The resistance to be connected to convert it into am ammeter of range 5 A is a 152 in series c 0 1 S2 in series b 12 in parallel d 0 1 92 in parallel

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