Answer
Verified
377.1k+ views
Hint:The amount of electric current flowing per unit cross-sectional area of a material is termed as current density. Mathematically we can write is current density as\[J=I/(A\cos \theta )\] here \[I\]is current flowing in the conductor, \[A\] is the area of cross section and \[\theta \] is the angle between current direction and area vector. Visualize the situation to get a better idea and use the mentioned formula to get the answer.
Complete step by step answer:
Current density is the amount of electric current flowing per unit cross sectional area of a material, we can write it mathematically as \[J=I/(A\cos \theta )\]. Generally, we write the mentioned formula as current equal to the dot product of current density and area of cross section from where \[\theta \] comes into play.
Before solving the question, keep in mind here, we are considering area as a vector whose direction is perpendicular to the surface or material (in this case conductor). Now
\[A=1\,c{{m}^{2}}={{10}^{(-4)}}\,{{m}^{2}} \\
\Rightarrow I=2A \\
\Rightarrow \theta ={{30}^{\circ }} \\
\Rightarrow \cos \theta =\sqrt{3}/2 \\ \]
Now we know \[J=I/(A\cos \theta )\] putting the values given above we get
\[\therefore J=(4/\sqrt{3})\times {{10}^{4}}\,A/{{m}^{2}}\]
Hence the current density at point \[p\] in the conductor is $(4/\sqrt{3})\times {{10}^{4}}\,A/{{m}^{2}}$.
Note:Such types of questions are normal formula based questions, so one should keep all the formulas in mind. Also there is an interesting thing on which questions are asked, current density is directly proportional to electric field \[J=\sigma E\] where \[\sigma \] is conductivity.
Complete step by step answer:
Current density is the amount of electric current flowing per unit cross sectional area of a material, we can write it mathematically as \[J=I/(A\cos \theta )\]. Generally, we write the mentioned formula as current equal to the dot product of current density and area of cross section from where \[\theta \] comes into play.
Before solving the question, keep in mind here, we are considering area as a vector whose direction is perpendicular to the surface or material (in this case conductor). Now
\[A=1\,c{{m}^{2}}={{10}^{(-4)}}\,{{m}^{2}} \\
\Rightarrow I=2A \\
\Rightarrow \theta ={{30}^{\circ }} \\
\Rightarrow \cos \theta =\sqrt{3}/2 \\ \]
Now we know \[J=I/(A\cos \theta )\] putting the values given above we get
\[\therefore J=(4/\sqrt{3})\times {{10}^{4}}\,A/{{m}^{2}}\]
Hence the current density at point \[p\] in the conductor is $(4/\sqrt{3})\times {{10}^{4}}\,A/{{m}^{2}}$.
Note:Such types of questions are normal formula based questions, so one should keep all the formulas in mind. Also there is an interesting thing on which questions are asked, current density is directly proportional to electric field \[J=\sigma E\] where \[\sigma \] is conductivity.
Recently Updated Pages
How many sigma and pi bonds are present in HCequiv class 11 chemistry CBSE
Mark and label the given geoinformation on the outline class 11 social science CBSE
When people say No pun intended what does that mea class 8 english CBSE
Name the states which share their boundary with Indias class 9 social science CBSE
Give an account of the Northern Plains of India class 9 social science CBSE
Change the following sentences into negative and interrogative class 10 english CBSE
Trending doubts
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
The Equation xxx + 2 is Satisfied when x is Equal to Class 10 Maths
In Indian rupees 1 trillion is equal to how many c class 8 maths CBSE
Which are the Top 10 Largest Countries of the World?
How do you graph the function fx 4x class 9 maths CBSE
Give 10 examples for herbs , shrubs , climbers , creepers
Difference Between Plant Cell and Animal Cell
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
Why is there a time difference of about 5 hours between class 10 social science CBSE