JEE Mains · Physics · STD 12 -7. Alternating current
An \(AC\) source is connected to an inductance of \(100\,mH\) a capacitance of \(100\,\mu F\) and a resistance of \(120\,\Omega\) as shown in figure. The time in which the resistance having a thermal capacity \(2\,J^{\circ } C\) will get heated by \(16^{\circ} C\) is ..........\(S\)
- A \(14\)
- B \(15\)
- C \(10\)
- D \(13\)
Answer & Solution
Correct Answer
(B) \(15\)
Step-by-step Solution
Detailed explanation
\(\left|\left( X _{ L }- X _{ C }\right)\right|=\left|10-10^{2}\right|=90\,\Omega\) \(Z =\) Impendance \(=\sqrt{\left( X _{ L }- X _{ C }\right)^{2}+ R ^{2}}=\sqrt{(90)^{2}+(20)^{2}}=150\,\Omega\) \(i _{ ms }=\frac{ V _{\text {mas }}}{ z }=\left(\frac{2}{15}\right) A\) Now…
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Physics
- A metal wire of resistance \(3\,\Omega \) is elongated to make a uniform wire of double its previous length. The new wire is now bent and the ends joined to make a circle. If two points on this circle make an angle \(60^o\) at the centre, the equivalent resistance between these two points will beJEE Mains 2019 Medium
- A plane electromagnetic wave of frequency \(100\, MHz\) is travelling in vacuum along the \(x -\) direction. At a particular point in space and time, \(\overrightarrow{ B }=2.0 \times 10^{-8} \hat{ k } T\). (where, \(\hat{ k }\) is unit vector along \(z-\)direction) What is \(\overrightarrow{ E }\) at this point ?JEE Mains 2021 Medium
- First, a set of \({n}\) equal resistors of \(10\; \Omega\) each are connected in series to a battery of emf \(20\; {V}\) and internal resistance \(10\; \Omega .\) A current \(I\) is observed to flow. Then, the \(n\) resistors are connected in parallel to the same battery. It is observed that the current is increased \(20\) times, then the value of \(n\) is .... .JEE Mains 2021 Hard
- A gas mixture consists of \(8\) moles of argon and \(6\) moles of oxygen at temperature \(T\). Neglecting all vibrational modes, the total internal energy of the system is _______.JEE Mains 2024 Hard
- Two ions of masses \(4 \,{amu}\) and \(16\, amu\) have charges \(+2 {e}\) and \(+3 {e}\) respectively. These ions pass through the region of constant perpendicular magnetic field. The kinetic energy of both ions is same. Then :JEE Mains 2021 Hard
- A particle is moving along a circular path with a constant speed of \(10\,ms^{-1}.\) What is the magnitude of the change in velocity of the particle, when it moves through an angle of \(60^{o}\) around the centre of the circle .......... \(m/s\)JEE Mains 2019 Medium
More PYQs from JEE Mains
- Two springs of force constants \(300\, N/m\) (Spring \(A\)) and \(400\, N/m\) (Spring \(B\)) are joined together in series . The combination is compressed by \(8.75\, cm\). The ratio of energy stored in \(A\) and \(B\) is \(\frac{{{E_A}}}{{{E_B}}}\). Then \(\frac{{{E_A}}}{{{E_B}}}\) is equal toJEE Mains 2013 Hard
- The area (in sq. units) of the region \(A\,\, = \,\left\{ {\left( {x\,,\,y} \right)\,:\,{x^2}\, \le \,y\, \le \,x + 2} \right\}\) isJEE Mains 2019 Hard
- If \(\left[ {\begin{array}{*{20}{c}}
1&1\\
0&1
\end{array}} \right]\,\left[ {\begin{array}{*{20}{c}}
1&2\\
0&1
\end{array}} \right]\,\left[ {\begin{array}{*{20}{c}}
1&3\\
0&1
\end{array}} \right]\,........\left[ {\begin{array}{*{20}{c}}
1&{n - 1}\\
0&1
\end{array}} \right]\, = \,\left[ {\begin{array}{*{20}{c}}
1&{78}\\
0&1
\end{array}} \right]\) then the inverse of \(\left[ {\begin{array}{*{20}{c}}
1&n\\
0&1
\end{array}} \right]\) isJEE Mains 2019 Hard - Let \(S\) be the set of all values of \(x\) for which the tangent to the curve \(y = f(x) = x^3 -x^2 -2x\) at \((x, y)\) is parallel to the line segment joining the points \((1,f(1))\) and \(( - 1,f( - 1)),\) then \(S\) is equal toJEE Mains 2019 Hard
- Let the lengths of intercepts on \(x\) -axis and \(y\) -axis made by the circle \(x^{2}+y^{2}+a x+2 a y+c=0\) \((a < 0)\) be \(2 \sqrt{2}\) and \(2 \sqrt{5}\), respectively. Then the shortest distance from origin to a tangent to this circle which is perpendicular to the line \(x +2 y =0,\) is euqal to :JEE Mains 2021 Hard
- If \(\int \frac{\sin ^{\frac{3}{2}} x+\cos ^{\frac{3}{2}} x}{\sqrt{\sin ^3 x \cos ^3 x \sin (x-\theta)}} d x=A \sqrt{\cos \theta \tan x-\sin \theta}+B \sqrt{\cos \theta-\sin \theta \operatorname{coc} x}+C,\) where \(C\) is the integration constant, then \(A B\) is equal toJEE Mains 2024 Hard