MHT CET · Physics · Electromagnetic Induction
A coil of effective area \(3 \mathrm{~m}^2\) is placed at right angles to a magnetic field of induction \(0.05 \mathrm{~Wb} / \mathrm{m}^2\). If the field is decreased to \(20 \%\) of its original value in 10 second, the e.m.f. induced in the coil will be
- A 10 mV
- B 12 mV
- C 15 mV
- D 20 mV
Answer & Solution
Correct Answer
(B) 12 mV
Step-by-step Solution
Detailed explanation
\( \varepsilon = -\frac{(B_{\text{final}} - B_{\text{initial}})A}{\Delta t} \) \( \varepsilon = -\frac{((0.20 \times 0.05 \mathrm{~Wb} / \mathrm{m}^2) - 0.05 \mathrm{~Wb} / \mathrm{m}^2) \times 3 \mathrm{~m}^2}{10 \mathrm{~s}} \)
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
- Four thin metal rods each of mass ' \(M\) ' and length ' \(L\) ', are welded end to end to form a square. The moment of inertia of the system about an axis passing through the centre of the square and perpendicular to its plane isMHT CET 2024 Medium
- Out of the following which law obeys the law of conservation of energy?MHT CET 2025 Easy
- A transistor has a voltage gain 'A'. If the amount ' \(\beta A^{\prime}\) of its output is appl put of the transistor, then the transistor becomes oscillator whereMHT CET 2020 Easy
- A body of mass ' \(\mathrm{m}\) ' \(\mathrm{kg}\) starts falling from a distance 3R above earth's surface. When it reaches a distance ' \(R\) ' above the surface of the earth of radius ' \(R\) ' and Mass ' \(M\) ', then its kinetic energy isMHT CET 2023 Medium
- Two open pipes of different lengths and of same diameter in which the air column vibrates with fundamental frequencies ‘ ’, and ‘ ’ respectively. When both pipes are joined to form a single pipe, its fundamental frequency will beMHT CET 2019 Hard
- The resistances in the left and right gap of a balanced metre bridge are \(12 \Omega\) and \(36 \Omega\) respectively If the resistances are interchanged the balance point shifts byMHT CET 2022 Easy
More PYQs from MHT CET
- The co-ordinator between Nervous and endocrine system isMHT CET 2015 Medium
- For a particle executing S.H.M., its potential energy is 8 times its kinetic energy at certain displacement ' \(\mathrm{x}\) ' from the mean position. If ' \(\mathrm{A}\) ' is the amplitude of S.H.M the value of ' \(x\) ' isMHT CET 2023 Hard
- A magnetizing field of 500 A/m produces a magnetic flux of Wb in an iron rod of cross-sectional area . The permeability of the rod in W/b/A-m isMHT CET 2019 Medium
- Identify the product formed in the following reaction.
\(\left(\mathrm{CH}_3 \mathrm{CO}\right)_2 \mathrm{O} \xrightarrow{\mathrm{H}_2 \mathrm{O}} \text { Product }\)MHT CET 2025 Easy -
The values taken by \(C, D, E, F\) are respectivelyMHT CET 2022 Easy - Alkyl cynides on reduction by sodium and ethanol give primary amines. This reaction is called asMHT CET 2020 Easy