JEE · NEET Previous Year Question
A conductor moving in the magnetic field and the induced current is . If the magnetic field is doubled the induced current will
Topic: JEE PYQ
Answer: C. Full step-by-step solution below.
- Aremain the same
- Bbe half
- Cbe doubled
- Dbe four times
Correct answer: C
Solution
(c) Given, initial magnetic field = BFinal magnetic field,
Final current = r
Since, emf,
where, is magnetic field,
l is length of conductor,
v is velocity,
I is current
Resistance = R
Induced emf
After magnetic field is doubled new current
B doubled then current I also doubled.
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