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NCAT - Practice Test - Physics - Electromagnetic Induction Quiz

Attempt 10 MCQs on NCAT - Practice Test - Physics - Electromagnetic Induction | Quiz 6

51. What happens if a 50 Hz transformer is used at 60 Hz?



52. How can magnetic flux through a coil be changed?



53. M=0.2 H, primary current changes from 5 A to 0 in 0.1 s. Find induced emf in secondary.



54. A 50-turn coil radius 0.1 m, B changes from 0.2 T to 0.8 T in 0.1 s (perpendicular). Find induced emf.



55. A 0.2 m wide conductor moves at 2 m/s into a 0.5 T field perpendicular. Find motional emf.



56. Transformer: Np=1000, Ns=250, Vp=240 V. Find Vs.



57. A generator gives 200 V, 10 A. Step-up transformer ratio 1:20. Find secondary current.



58. A solenoid has 500 turns, area 0.002 m², length 0.5 m. Find self-inductance (μ₀=4π×10⁻⁷).



59. Energy stored in 0.5 H inductor carrying 2 A is:



60. A step-down transformer has primary 220 V, 2 A, secondary 44 V. Find secondary current.



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