A source of constant potential difference is connected acro…

Physics Current Electricity General MCQ (Single Correct)

A source of constant potential difference is connected across a conductor having irregular cross-section as shown in the figure –

Electric field intensity at P is greater than that at Q

Rate of electrons crossing per unit area of cross-section at P is less than that at Q

The rate of generation of heat per unit length at P is greater than that at Q

Mean kinetic energy of free electrons at P is greater than that at Q

Text Solution

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The correct answer is:

Cross section at P is maximum at P

∴ current density at P is minimum

 E = ρJ

∴ Electric field at P is also minimum. E P < E Q ,

i P = i Q

⇒ J P < J Q , V P < V Q

Heat per unit length = =  R =

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