12th Standard Syllabus & Materials
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TN 12th Computer Applications வலையமைப்பு வடமிடல் Sample Question Papers Study Material - QB365 Set A
Published on: 01/06/2021
QB365 provides detailed and simple solution for every Book back Questions in class 12 Physics Subject. It will helps to get more idea about question pattern in every book back questions with solution.
Download Tamil Nadu 12th Standard Physics question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Physics Test1.
A non-conducting charged ring carrying a charge of q, mass m and radius r is rotated about its axis with constant angular speed ω. Find the ratio of its magnetic moment with angular momentum is _____.
\(\\ \frac { q }{ m } \)
\(\\ \frac { 2q }{ m } \)
\(\\ \frac { q }{ 2m } \)
\(\\ \frac { q }{ 4m } \)
2.
A wire of length l carrying a current I along the Y direction is kept in a magnetic field is given by \(\vec { B } =\frac { \beta }{ \sqrt { 3 } } =(\hat { i } +\hat { j } +\hat { k } )T.\) The magnitude of Lorentz force acting on the wire is _____.
\(\sqrt { \frac { 2 }{ { 3 } } } \beta Il\)
\(\sqrt { \frac { 1 }{ { 3 } } } \beta Il\)
\(\sqrt { 2 } \beta Il\)
\(\sqrt { \frac { 1 }{ 2 } } \beta Il\)
3.
Three wires of equal lengths are bent in the form of loops. One of the loops is circle, another is a semi-circle and the third one is a square. They are placed in a uniform magnetic field and same electric current is passed through them. Which of the following loop configuration will experience greater torque?
Circle
Semi-circle
Square
All of them
4.
A circular coil of radius 5 cm and 50 turns carries a current of 3 ampere. The magnetic dipole moment of the coil is nearly ____.
1.0 A m2
1.2 A m2
0.5 A m2
0.8 A m2
5.
An electron moves in a straight line inside a charged parallel plate capacitor of uniform charge density σ. The time taken by the electron to cross the parallel plate capacitor undeflected when the plates of the capacitor are kept under constant magnetic field of induction \((\vec{B})\) is
\({ \varepsilon }_{ ° }\frac { elB }{ \sigma } \)
\({ \varepsilon }_{ ° }\frac { lB }{ \sigma {l} } \)
\({ \varepsilon }_{ ° }\frac { lB }{ {e}\sigma } \)
\({ \varepsilon }_{ ° }\frac { lB }{ \sigma } \)
1.
Magnetic moment,
μ = IA
Angular momentum,
L = Iω
Ratio \(\frac{p_m}{L}=\frac{(q/T)\pi r^2}{mr^2\omega}=\frac{q}{2m}\)
2.
\(\vec { B } =\frac { \beta }{ \sqrt { 3 } } =(\hat { i } +\hat { j } +\hat { k } )T\)
Using an equation,
Lorentz force, \(\vec{F}=Il\hat{j}\times\vec B\)
We can get,
Lorentz force \(F=\sqrt { \frac { 2 }{ { 3 } } } \beta Il\)
3.
(a)
Circle
4.
Dipole moment, \(\vec{p}_m=n\times I\times\vec{A}\)
\(\vec{p}_m\) = 50 x 3 x 3.14 x 25 x 10-4 ≈ 1.2 A m2
5.
Electric field between the plates \(= \frac{σ}{ε_0}\)
Electric force on an electron \(= e\frac{σ}{ε_0}\)
Magnetic force on an electron, F = BIl
But, \(I= \frac{e}{t}\)
∵Electron moves in a straight line. So,
EF = MF
\(e\frac{σ}{ε_0}=B(\frac{e}{t})l\)
\(\therefore t = ε_0\frac{lB}{σ}\)
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Tamilnadu Stateboard 12th Standard Subjects
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Accountancy
History
Computer Applications
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Computer Science
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