JEE Mains · Physics · STD 12 -7. Alternating current
When a dc voltage of \(100 \mathrm{~V}\) is applied to an inductor, a dc current of \(5 \mathrm{~A}\) flows through \(1\) . When an ac voltage of \(200 \mathrm{~V}\) peak value is connected to inductor, its inductive reactance is found to be \(20 \sqrt{3} \Omega\). The power dissipated in the circuit is _______\(W\).
- A \(238\)
- B \(240\)
- C \(245\)
- D \(250\)
Answer & Solution
Correct Answer
(D) \(250\)
Step-by-step Solution
Detailed explanation
For \(DC\) voltage \(\mathrm{R}=\frac{\mathrm{V}}{\mathrm{I}}=\frac{100}{5}=20 \Omega\) for \(AC\) voltage \(\mathrm{X}_{\mathrm{L}}=20 \sqrt{3} \Omega\) \(\mathrm{R}=20 \Omega\) \(\mathrm{Z}=\sqrt{\mathrm{X}_{\mathrm{L}}^2+\mathrm{R}^2}=\sqrt{3 \times 400+400}=40\) Power…
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
- Light wave traveling in air along \(x\)-direction is given by \(E _{ y }=540 \sin \pi \times 10^{4}( x - ct ) Vm ^{-1}\). Then, the peak value of magnetic field of wave will be \(\dots \times 10^{-7}\,T\) (Given \(c =3 \times 10^{8}\,ms ^{-1}\) )JEE Mains 2022 Easy
- The volume \(V\) of a given mass of monoatomic gas changes with temperature \(T\) according to the relation \(V = KT ^{2 / 3}\). The workdone when temperature changes by \(90\, K\) will be \(x\,R\). The value of \(x\) is \([ R =\) universal gas constant \(]\)JEE Mains 2021 Hard
- Match List I with List II
Choose the correct answer from the options given below:List - I List - II A. AM Broadcast I. \(88-108 MHz\) B. FM Broadcast II. \(540-1600 kHz\) C. Television III. \(3.7-4.2GHz\) D. Satellite Communication IV. \(54 MHz-590MHz\) JEE Mains 2023 Medium - Consider a \(72\, cm\) long wire \(AB\) as shown in the figure. The galvanometer jockey is placed at \(P\) on \(A B\) at a distance \(x cm\) from \(A\). The galvanometer shows zero deflection. The value of \(x,\) to the nearest integer, is ..... \(cm\)
JEE Mains 2021 Medium - The potential energy \((U)\) of a diatomic molecule is a function dependent on \(r\) (interatomic distance) as \(U =\frac{\alpha}{ r ^{10}}-\frac{\beta}{ r ^{5}}-3\) where, \(\alpha\) and \(\beta\) are positive constants. The equilibrium distance between two atoms will be \(\left(\frac{2 \alpha}{\beta}\right)^{\frac{a}{b}},\) where a \(=\) ..........JEE Mains 2021 Hard
- If a rubber ball falls from a height \(h\) and rebounds upto the height of \(h / 2\). The percentage loss of total energy of the initial system as well as velocity ball before it strikes the ground, respectively, are _______.JEE Mains 2024 Hard
More PYQs from JEE Mains
- If \({ }^{20} \mathrm{C}_{\mathrm{r}}\) is the co-efficient of \(\mathrm{x}^{\mathrm{r}}\) in the expansion of \((1+x)^{20}\), then the value of \(\sum_{r=0}^{20} r^{2}\,\,{ }^{20} C_{r}\) is equal to :JEE Mains 2021 Hard
- If the points of intersection of two distinct conics \(x^2+y^2=4 b\) and \(\frac{x^2}{16}+\frac{y^2}{b^2}=1\) lie on the curve \(y^2=3 x^2\), then \(3 \sqrt{3}\) times the area of the rectangle formed by the intersection points is ...........JEE Mains 2024 Hard
- A longitudinal wave is represented by \(x =10 \sin 2 \pi\left( nt -\frac{ x }{\lambda}\right) \,cm\). The maximum particle velocity will be four times the wave velocity if the determined value of wavelength is equal to .....................JEE Mains 2022 Hard
- A string is wrapped around the rim of a wheel of moment of inertia \(0.40 \mathrm{kgm}^2\) and radius \(10 \mathrm{~cm}\). The wheel is free to rotate about its axis. Initially the wheel is at rest. The string is now pulled by a force of \(40 \mathrm{~N}\). The angular velocity of the wheel after \(10\) \(\mathrm{s}\) is \(\mathrm{x} \mathrm{rad} / \mathrm{s}\), where \(\mathrm{x}\) is _______.JEE Mains 2024 Hard
- A double slit interference experiment performed with a light of wavelength 600 nm forms an interference fringe pattern on a screen with 10 th bright fringe having its centre at a distance of 10 mm from the central maximum. Distance of the centre of the same 10th bright fringe from the central maximum when the source of light is replaced by another source of wavelength 660 nm would be _________ mm .JEE Mains 2025 Hard
- The number of ways of selecting \(15\) teams from \(15\) men and \(15\) women, such that each team consists of a man and a woman, isJEE Mains 2015 Hard