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As shown in the figure, a rectangular loop of a conducting wire is moving away with a constant velocity v in a perpendicular direction from a very long straight conductor carrying a steady current I. When the breadth of the rectangular loop is a very small compare to its distance from the straight conductor, how does the e.m.f. E induced in the loop vary with time t ?
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Important Questions on Electromagnetic Induction

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MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 2 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 10 - Electromagnetic Induction>Competitive Thinking>Q 139
A square loop of wire of side length 10 cm is placed at angle of  45° with a magnetic field that changes uniformly from 0.1 T to zero in 0.7 s. The induced current in the loop (its resistance is1 Ω) is,
 
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MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 2 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 10 - Electromagnetic Induction>Competitive Thinking>Q 140
In a coil, rate of change of area is 5 m2 per millisecond and current becomes 1 ampere from 2 ampere in 2×10-3 s. If magnitude of field is 1 tesla, then self inductance of the coil is
 
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MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 2 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 10 - Electromagnetic Induction>Competitive Thinking>Q 141
The primary and secondary coils of a transformer have 50 and 1500 turns, respectively. If the magnetic flux ϕ linked with the primary coil is given by ϕ=ϕ0+4t, where ϕ is in Wb, t is in s and ϕ0 is a constant, the output voltage across the secondary coil is
 
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MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 2 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 10 - Electromagnetic Induction>Competitive Thinking>Q 142
An alternating current i=2π Asinωt flows through the primary coil of the transformer. The coefficient of mutual inductance between primary and secondary coil is 1 H. The peak EMF induced in secondary coil is:
(frequency of AC=50 Hz)
 
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MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 2 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 10 - Electromagnetic Induction>Competitive Thinking>Q 143

Assertion: A vertical iron rod has a coil of wire wound over it at the bottom end. An alternating current flows in the coil. The rod goes through a conducting ring as shown in the figure. The ring can float at a certain height above the coil.

Reason: In the above situation, a current is induced in the ring which interacts with the horizontal component of the magnetic field to produce an average force in the upward direction.

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MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 2 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 10 - Electromagnetic Induction>Competitive Thinking>Q 144
A conducting circular loop is placed in uniform magnetic field, B=0.025 T with its plane perpendicular to the loop. The radius of the loop is made to shrink at a constant rate of 1 mm s-1. The induced e.m.f. when radius is 2 cm is,
 
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MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 2 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 10 - Electromagnetic Induction>Competitive Thinking>Q 145
The graph shows the variation in magnetic flux ϕ(t) with time through a coil. Which of the statements given below is not correct?
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MHT-CET TRIUMPH Physics Multiple Choice Questions Part - 2 Based on Std. XI & XII Syllabus of MHT-CET>Chapter 10 - Electromagnetic Induction>Competitive Thinking>Q 146
A metallic rod of length l is tied to a string of length 2l and made to rotate with angular speed ω on a horizontal table with one end of the string fixed. If there is a vertical magnetic field B in the region, the e.m.f. induced across the ends of the rod is