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.

  1. Aremain the same
  2. Bbe half
  3. Cbe doubled
  4. Dbe four times

Correct answer: C

Solution

(c) Given, initial magnetic field = B
Final 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.

More Electromagnetic Induction PYQs