Questions
A uniform magnetic field is restricted within a region of radius “r”. The magnetic field changes with time at a rate . Loop 1 of radius R > r encloses the region r and loop 2 of radius R is outside the region of magnetic field as shown in the figure. Then the e.m.f. generated is
detailed solution
Correct option is D
Emf generated in loop 1,ε1=-dϕdt=-ddt(B→·A→)=-ddt(BA)=-A×dBdtε1=-πr2dBdt∵A=πr2 because dBdt is restricted upto radius r.Emf generated in loop 2,ε2=-ddt(BA)=-ddt(0×A)=0Talk to our academic expert!
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A coil having n turns and resistance R is connected with a galvanometer of resistance 4 R . This combination is moved in time t seconds from a magnetic field B1 weber to B2 weber. The induced current in the-circuit is
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