JEE PHYSICS MCQ: CURRENT ELECTRICITY

1 Medium

1 of 1

Application +4 | -1

Two discharge tubes have identical material structure and the same gas is filled in them. The length of one tube is

10 \mathrm{~cm}

and that of the other tube is

20 \mathrm{~cm}

. Sparking starts in both the tubes when the potential difference between the cathode and the anode is

100 \mathrm{~V}

. If the pressure in the shorter tube is

1.0 \mathrm{~mm}

of mercury, what is the pressure in the longer tube?

View answer and explanation

Correct option: A

0.5 \mathrm{~mm}

of mercury

Option A (

0.5 \mathrm{~mm}

of mercury) is correct because the sparking potential depends on the product of pressure and distance.

More Questions from CURRENT ELECTRICITY

Practice All Chapter MCQs →

\mathrm{\rho }

3\,\,{\mathrm{m}^3}

3\,\,\mathrm{\Omega }

4.7\,\, \times \,\,{10^6}\,\,\mathrm{\Omega }\,\, \pm \,\,5\,\,\%

22.5\,cm