Download App

Current Electricity — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsCurrent Electricity2 Marks
Question
Any current flowing through a copper wire when passed through an iron wire of same thickness. What will be the effect on its drift velocity?
✓

Answer

$I =n_e A_{v d}$ or $v_d=\frac{ I }{n e A}$, where $I , e$ and A are constant. Hence, $v_d \propto \frac{1}{n}$. The free electron density ( $n$ ) is less in iron than in copper, drift velocity will be more in iron than in copper.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "2 Marks Questions" from Current Electricity→Current Electricity — all question types→Physics STD 12 Science question papers→Gujarat Board STD 12 Science question papers→Gujarat Board question paper generator→

Similar questions

Find the ratio of the magnitude of the electric force to the gravitational force acting between two protons.
→
A transmission wire carries a current of 100A. What would be the magnetic field B at a point on the road if the wire is 8m above the road?
→
Find the number of molecules in $1cm^3$ of an ideal gas at 0^\circC and at a pressure of $10^{-5}$ mm of mercury.
→
Write and explain Kirchhoff's junction rule.
→
Write the formula to determine the refractive index of the material of the prism in the case of minimum deviation.
→
Calculate the mass of $1cm^3$ of oxygen kept at STP.
→
Depict the field-line pattern due to a current-carrying solenoid of finite length.
i. In what way do these lines differ from those due to an electric dipole?
ii. Why can't two magnetic field lines intersect each other?
→
Derive the equation $($formula$)$ showing the relationship between electric field and electric potential.
→
Write a short note on Micro waves.
→
Answer the following question:
The refractive index of diamond is much greater than that of ordinary glass. Is this fact of some use to a diamond cutter?
→