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2 answers:
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Answer:
ε= 7.86 mV, Current: Anti-clockwise
Explanation:
radius= 50 mm
dt= 0.10 s
Initial magnitude of magnetic field= B1 = 200 mT
Final magnitude of magnetic field = B2 = 300 mT
Ф= B. A= BA cosα
Ф1= B1 * A * cosα
Ф1=
Ф1= 0.00157 Wb
Ф2= B2 * A * cosα
Ф1=
Ф2=0.00236 Wb
dФ= Ф2 - Ф1
dФ= 0.00236 - 0.00157
dФ= 0.000786 Wb
ε= Ф
ε=0.001786/ 0.10
ε=0.00786 v = 7.86 mV
b)
According to lenz's law the induced emf always oppose the cause producing it.
Applied field is out of the paper so the current will flow in anti-clockwise direction to produce north pole pointing toward the paper.