COMEDK · Physics · 22. Electromagnetic Induction
A current of 2 A is passed through the primary coil. The total flux linked with the secondary coil, which is closely wound over the primary is \(2000 \times 10^{-6}\) weber. What is the induced emf in the secondary if the current through the primary increases at a rate of \(0.2 \mathrm{As}^{-1}\) ?
- A \(2 \times 10^{-4} V\)
- B \(4 \times 10^{-4} V\)
- C \(1 \times 10^{-4} V\)
- D \(8 \times 10^{-4} V\)
Answer & Solution
Correct Answer
(A) \(2 \times 10^{-4} V\)
Step-by-step Solution
Detailed explanation
The magnetic flux \(\phi\) linked with the secondary coil is proportional to the current \(I\) in the primary coil, given by \(\phi = MI\), where \(M\) is the mutual inductance between the coils. Given the flux \(\phi = 2000 \times 10^{-6} \text{ Wb}\) when the current…
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
- Choose the correct statement.COMEDK 2012 Easy
- Two bodies of masses \(1 \mathrm{~kg}\) and \(2 \mathrm{~kg}\) have equal momentum, then the ratio of their kinetic energies isCOMEDK 2013 Easy
- The square root of the product of inductance and capacitance has the dimension ofCOMEDK 2017 Easy
- A particle ' \(X\) ' carrying a charge \(+Q\) is moving in a circular path of radius \(R\) around another particle ' \(Y\) ' having a charge \(-Q\) with a frequency ' \(v\) '. Then the mass ' \(m\) ' of the charged particle isCOMEDK 2025 Medium
- Two guns \(P\) and \(Q\) can fire bullets at speeds \(2 \mathrm{~km} / \mathrm{s}\) and \(4 \mathrm{~km} / \mathrm{s}\), respectively. From a point on a horizontal ground, they are fired in all possible directions. The ratio of maximum or areas covered by the bullets fired by the two guns, on the ground isCOMEDK 2022 Medium
- Two particles of masses \(m_{1}=m, m_{2}=2 m\) and charges \(q_{1}=q, q_{2}=2 q\) entered into uniform magnetic field with the same velocity and at the same angle. Find \(F_{1} / F_{2}\) (force ratio).COMEDK 2021 Easy
More PYQs from COMEDK
- The molecules of a given mass of a gas have root mean square speed of \(120 \mathrm{~m} / \mathrm{s}\) at \(88^{\circ} \mathrm{C}\) and 1 atmospheric pressure. The root mean square speed of the molecules at \(127^{\circ} \mathrm{C}\) and 2 atmospheric pressure isCOMEDK 2023 Medium
- The string of length \(2 \mathrm{~m}\) is fixed at both ends. If the string vibrates in its fourth normal mode with a frequency of \(500 \mathrm{~Hz}\), then the waves would travel on it with a velocity ofCOMEDK 2022 Medium
- If in a \(\triangle A B C, \angle C=\frac{\pi}{2}\), then \(\tan ^{-1}\left(\frac{a}{b+c}\right)+\tan ^{-1}\left(\frac{b}{c+a}\right)=\)COMEDK 2017 Hard
- Match the Vitamins given in Column I with the diseases caused by their deficiency as given in Column II.
No. Vitamin No. Deficiency A K P Cheilosis B \(B_{12}\) Q Osteomalacia C \(B_2\) R Permicious Anaemia D D S Haemophilia COMEDK 2024 Easy - If \(f(x)=\left\{\begin{array}{cl}\frac{1-\cos x}{x} & x \neq 0 \\ k & x=0\end{array}\right.\) is continuous at \(x=0,\), then the value of \(k\) isCOMEDK 2013 Easy
- Select the correct statement from the following:COMEDK 2025 Medium