Answer to Question #61980 in Electric Circuits for musbahuuuu

Question

16 In the circuit diagram shown, the device marked X is a -----------------
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rheostat
voltmeter
jockey
galvanometer
17 The null condition in potentiometer experiment shows that
the potential difference under test is zero
current is varying in the circuit
potential differences are varying in the circuit
potential difference are balanced
18 The potentiometer wire plays equivalent role of which of these devices in a circuit?
rheostat
thermostat
galvanometer
ammeter
19 The advantage of potentiometer over voltmetr in measurements of emf is that
the potentiometer wire is assumed to be uniform
it does not draw current from the circuit under test
the temperatue of the wire must remain constant
faults may arise due to breaks or wrong connections in the circuit