Start Free Mock LoginAlready registered? Login here

Physics - Current Electricity Question with Solution | TestHub

PhysicsCurrent ElectricityElectrical instrumentMedium2 minPYQ_2017

PhysicsMediumsingle choice

A potentiometer wire, $10 m$ long, has a resistance of $40Ω$ . It is connected in series with a resistance box and a $2 V$ storage cell. If the potential gradient along the wire $0.1 m$ is $V / cm$ , the resistance unplugged in the box is

Options:

Answer:

Solution:

Potential gradient along wire $= \frac{potential difference along wire}{length of wire}$ or, $0.1 \times 1 0^{- 3} = \frac{I \times 40}{1000} V / cm$ or, Current in wire, $I = \frac{1}{400} A$ or, $\frac{2}{40 + R} = \frac{1}{400}$ or $R = 800 - 40 = 760Ω$

Stream:VITEEESubject:PhysicsTopic:Current ElectricitySubtopic:Electrical instrument

⏱ 2mℹ️ Source: PYQ_2017

Doubts & Discussion

Loading discussions...