COMEDK · Physics · 22. Electromagnetic Induction
An AC generator having 400 turns and an area of cross section of \(2 \times 10^{-3}\ m^2\) rotates with an angular speed of \(200\pi\ rad\ s^{-1}\) in a uniform magnetic field of strength 0.4 T. The generator is connected to the primary of an ideal transformer having 500 turns in the primary and 2000 turns in the secondary. The secondary is connected to a \(400\ \Omega\) resistive load. What is the rms current in the secondary of the transformer? Assume, the transformer is ideal and the resistance of the coil is negligible
- A \(2.84\ \text{A}\)
- B \(28.4\ \text{A}\)
- C \(1.41\ \text{A}\)
- D \(14.2\ \text{A}\)
Answer & Solution
Correct Answer
(C) \(1.41\ \text{A}\)
Step-by-step Solution
Detailed explanation
The peak emf generated by the AC generator is given by \(E_0 = NBA\omega\). Substituting the given values, \(E_0 = 400 \times 0.4 \times (2 \times 10^{-3}) \times 200\pi = 64\pi \text{ V}\). The rms voltage across the primary coil of the transformer is…
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
- If \(150 \mathrm{~J}\) of heat is added to a system and the work done by the system is \(110 \mathrm{~J}\), then change in internal energy will beCOMEDK 2023 Easy
- A ball is dropped from the top of the building \(100 \mathrm{~m}\) high. Simultaneously, another ball is thrown upwards from the bottom of the building with such a velocity that the balls collide exactly mid-way. What is the speed in \(\mathrm{ms}^{-1}\) with which the second ball is thrown? (Take, \(g=10 \mathrm{~ms}^{-2}\) )COMEDK 2015 Medium
- An aeroplane is flying horizontally with a velocity of \(360 \mathrm{~km} \mathrm{~h}^{-1}\). The distance between the tips of the wings of the aeroplane is \(50 \mathrm{~m}\). The vertical component of the earth's magnetic field is \(4 \times 10^{-4} \mathrm{Wbm}^{-2}\). The induced emf isCOMEDK 2014 Medium
- The power of a gun which fires 120 bullet per minute with a velocity \(120 \mathrm{~ms}^{-1}\) is : (given the mass of each bullet is \(100 \mathrm{~g}\))COMEDK 2024 Medium
- A glass hemisphere of radius \(0.1 \mathrm{~cm}\) and refractive index \(1.5\) is placed over a spot on a table and the spot is viewed from above. The spot appears to be
COMEDK 2012 Hard - If units of mass, length and gravitational constant are chosen to fundamental units, the dimensions of time would beCOMEDK 2024 Medium
More PYQs from COMEDK
- If \(\frac{b+c}{11}=\frac{c+a}{12}=\frac{a+b}{13}\), then \(\cos A\) is equal toCOMEDK 2012 Medium
- A distinctive and characteristic functional group of fats isCOMEDK 2018 Hard
- An elevator cable is to have a maximum stress of \(7 \times 10^7 \mathrm{~N} / \mathrm{m}^2\) to allow for appropriate safety factors. Its maximum upward acceleration is \(1.5 \mathrm{~m} / \mathrm{s}^2\). If the cable has to support the total weight of 2000 kg of a loaded elevator, the area of cross-section of the cable should beCOMEDK 2024 Easy
- The number of triangles in a complete graph with 10 non-collinear vertices isCOMEDK 2018 Easy
- If \(\tan \alpha=\dfrac{1}{7}\) and \(\sin \beta=\dfrac{1}{\sqrt{10}}, \quad 0 <\alpha, \beta <\dfrac{\pi}{2}\) then \(2 \beta\) is equal toCOMEDK 2025 Medium
- Electrons are excited from \(n=1\) to \(n=4\) state. During downward transitions, possible number of spectral lines observed in Balmer series isCOMEDK 2016 Easy