Angle of Minimum Deviation - B
Conversion of Galvanometer to Voltmeter - A
Galvanometer Resistance: Half Deflection - A
Ohm’s law states that “The current passing thru a conductor is directly proportional to the potential difference across its ends, given that the physical conditions - temperature, pressure and dimensions - of conductor do not change.”
V = Potential Diff across its ends (SI Unit - Volts)
I = Current Flowing through conductor (SI Unit - Ampere)
R = Resistance of Conductor (SI Unit - Ohm)
$V ∝ I$ $V = IR$ (where R is the constant of proportionality) $V/I = R$ (working formula)
R depends upon the nature of material, temperature and dimensions of the conductor.
To prove ohm’s law, ratio of V/I must remain constant for given resistance
∴ Graph b/w V & I will be a straight line
The constant ratio gives unknown value of resistance ( $V/I = R$ )
