E.m.f. of a Weston cell is accurately measured by

1.	E.m.f. of a Weston cell is accurately measured by
A.	electrostatic voltmeter
B.	hot wire voltmeter
C.	isothermal voltmeter
D.	electrodynamic voltmeter
Answer» B. hot wire voltmeter

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E.m.f. of a Weston cell is accurately measured by

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