electromagnetic-induction Question 10
Question: Q. 2. A rectangular frame of wire is placed in a uniform magnetic field directed outwards, normal to the paper.
A [CBSE Comptt. I 2018]
The induced emf, therefore varies with time sinusoidally.
[CBSE Marking Scheme 2018]
Alternate Answer :
Arm
Q. 3. A wire in the form of a tightly wound solenoid is connected to a
U] [SQP I 2017] [NCERT Exemplar]
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Solution:
Ans. Lenz’s law allows the emf to induce in spirals that opposes and lead to decrease in magnetic flux by increasing the current. This is because when the coil is stretched and air gaps are created between successive elements of the spiral coil, magnetic flux will leak through the gaps. As magnetic flux decreases, current increases to oppose the decrements of flux.
