COMEDK · Physics · 22. Electromagnetic Induction
The magnetic flux linked with a coil is given by the equation: \(\phi = 8t^2 + t + 10\). The e.m.f. induced in the coil at \(t = 3\) seconds will be:
- A 49 V
- B 16 V
- C 33 V
- D 20 V
Answer & Solution
Correct Answer
(A) 49 V
Step-by-step Solution
Detailed explanation
The magnetic flux linked with the coil is given by \(\phi = 8t^2 + t + 10\). The induced electromotive force (e.m.f.) in the coil is given by Faraday's law of induction: \(\varepsilon = -\dfrac{d\phi}{dt}\). Differentiating the flux with respect to time \(t\):…
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
- Consider a thin spherical shell of radius \(R\) consisting of uniform surface charge density \(s\). The electric field at a point of distance \(x\) from its centre and outside the shell isCOMEDK 2020 Medium
- A body is executing SHM. When its displacements from the mean position are \(4 \mathrm{~cm}\) and \(5 \mathrm{~cm}\) it has velocity \(10 \mathrm{~cms}^{-1}\) and \(8 \mathrm{~cms}^{-1}\) respectively. Its periodic time \(\mathrm{t}\) isCOMEDK 2024 Medium
- In a Young's double slit experiment, the two interfering waves forming the interference pattern have the same amplitude. The phase difference between the two waves reaching a point X is \(\dfrac{\pi}{3}\). What will be the phase difference between the two waves at a point Y if the intensity ratio at X and Y is \(3: 2\) ?COMEDK 2025 Medium
- The mean energy per molecule for a diatomic gas isCOMEDK 2023 Easy
- A plano-convex lens made of refractive index 1.5 and having radius of curvature \(\mathrm{R}=4 \mathrm{~cm}\) fits exactly into a plano-concave lens made of refractive index 1.3 and having the same radius of curvature \(\mathrm{R}=4 \mathrm{~cm}\) such that their plane surfaces are parallel to each other. The focal length of the combination is:COMEDK 2025 Medium
- A sample of a radioactive element whose half-life is 30 s contains a million nuclei at a certain instant of time. How many nuclei will be left after \(10 \mathrm{~s}\) ?COMEDK 2015 Hard
More PYQs from COMEDK
- The lines represented by \(a x^{2}+2 h x y+b y^{2}=0\) are perpendicular to each other ifCOMEDK 2016 Easy
- If the mean of \(4,7,2,8,6\) and \(k\) is 7 . Then the mean deviation from the mean of these observations isCOMEDK 2025 Medium
- Two concentric circular coils, each having 10 turns with radii \(0.2 \mathrm{~m}\) and \(0.4 \mathrm{~m}\) carry currents \(0.2 \mathrm{~A}\) and \(0.3 \mathrm{~A}\) respectively in opposite directions. Magnetic field at the centre isCOMEDK 2016 Hard
- A system containing a ball is oscillating on a frictionless horizontal plane. The position of the mass when its potential energy and its kinetic energy both are equal, is (let \(A\) is the amplitude of oscillation)COMEDK 2014 Medium
- A and B play a game where each is asked to select a number from 1 to 25 . If the two numbers match, both will win a prize. The probability that they will NOT win a prize in a single trial isCOMEDK 2025 Easy
- \(\sin ^{2} 175^{\circ}+\sin ^{2} 725^{\circ}\) is equal toCOMEDK 2020 Easy