AP EAMCET · PHYSICS · Electromagnetic Induction
A coil of 45 turns and radius 4 cm is placed in a uniform magnetic field such that its plane is perpendicular to the direction of the field. If the magnetic field increases from 0 to 0.70 T at a constant rate in a time interval of 220 s, then the induced emf in the coil is
- A 0.32 mV
- B 0.50 mV
- C 0.72 mV
- D 0.96 mV
Answer & Solution
Correct Answer
(C) 0.72 mV
Step-by-step Solution
Detailed explanation
\(A = \pi r^2 = \pi (0.04 \text{ m})^2\) \(\frac{dB}{dt} = \frac{0.70 \text{ T}}{220 \text{ s}}\) \(\varepsilon = N A \frac{dB}{dt} = 45 \times \pi (0.04 \text{ m})^2 \times \frac{0.70 \text{ T}}{220 \text{ s}} \approx 0.00072 \text{ V} \approx 0.72 \text{ mV}\)
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
- The force per unit length on a straight wire carrying current of 8 A making an angle of \(30^{\circ}\) with a uniform magnetic field of 0.15 T isAP EAMCET 2025 Easy
- A particle crossing the origin at time \(t=0\), moves in the \(x y\)-plane with a constant acceleration ' \(a\) ' in \(y\)-direction. If the equation of motion of the particle is \(y=b x^2\) (where b is a constant), then its velocity component in the x -direction isAP EAMCET 2025 Medium
- In a meter-bridge if the left and right gaps are connected with \(2 \Omega\) and \(3 \Omega\) resistances, respectively then the bridge is balanced. The resistance to be connected with \(3 \Omega\) resistance to get the balancing point at midpoint of the bridge wire isAP EAMCET 2019 Medium
- An information signal of frequency 10 kHz is modulated with a carrier waive of frequency 3.61 MHz. The upper side and lower side frequencies are:AP EAMCET 2024 Easy
- The speed of the electron is a hydrogen atom in the \(n=3\) level is \(\left(\right.\) Plank constant \(\left.=6.6 \times 10^{-34} \mathrm{JS}\right)\)AP EAMCET 2024 Easy
- Three moles of an ideal monoatomic gas undergoes a cyclic process as shown in the figure. The temperature of the gas in different states marked as 1, 2, 3 and 4 are \(400 \mathrm{~K}, 700 \mathrm{~K}, 2500 \mathrm{~K}\) and \(1100 \mathrm{~K}\) respectively. The work done by the gas during the process 1-2-3-4-1 is (universal gas constant is \(R\) )
AP EAMCET 2013 Medium
More PYQs from AP EAMCET
- If \(\frac{2 x^2+5 x+6}{(x+2)^3}=\frac{a}{x+2}+\frac{b}{(x+2)^2}+\frac{c}{(x+2)^3}\) then \(\mathrm{a} . \mathrm{b}+\mathrm{b} . \mathrm{c}+\mathrm{c} . \mathrm{a}=\)AP EAMCET 2023 Easy
- Which of the following is a favourable factor for cation formation?AP EAMCET 2004 Easy
- A thermally insulated vessel with nitrogen gas at \(27^{\circ} \mathrm{C}\) is moving with a velocity of \(100 \mathrm{~ms}^{-1}\). If the vessel is stopped suddenly, then the percentage change in the pressure of the gas is nearly
(assume entire loss in \(\mathrm{KE}\) of the gas is given as heat to gas and \(R=8.3 \mathrm{Jmol}^{-1} \mathrm{~K}^{-1}\) )AP EAMCET 2018 Medium - The number of integral vaules of \(x\) satisfying \(5 x-1 < (x+1)^2 < 7 x-3\) isAP EAMCET 2018 Hard
- A coil of area is placed in a uniform magnetic field of lb. , with its plane perpendicular to the field. The coil rotates at a uniform rate to complete the revolution in . find the average emf . in the coil during intervals when the coil rotates from
i. to position
ii. to position
ii. to position
iv. to positionAP EAMCET 2020 Hard - If \(h^2=a b\), then the slopes of lines represented by \(a x^2-2 h x y+b y^2=0\) would be in the ratioAP EAMCET 2021 Easy