A conductor rod moving with a velocity v perpendicular to a uniform magnetic field B. If the length of the rod perpendicular to both v and B is L, the induced EMF across its ends is given by?
Show answer & explanation
Correct answer: B
Explanation
Answer: BLv
Explanation: When a conductor rod of length L moves with velocity v perpendicular to a uniform magnetic field B, the charges inside the rod experience a magnetic force. This separation of charges creates an induced electromotive force (EMF).
The formula for induced EMF is given by:
Where:
B = magnetic field strength
L = length of the rod
v = velocity of the rod
Thus, the correct expression is BLv.
Additional Key Points:
This phenomenon is based on Faraday’s Law of Electromagnetic Induction
Also known as motional EMF
Maximum EMF is induced when velocity is perpendicular to the magnetic field
Direction of induced current is given by Fleming’s Right-Hand Rule
If motion is parallel to the field, EMF = 0
Potential Exam-Oriented Questions & Answers:
Question: Which rule gives direction of induced current?
Answer: Fleming’s Right-Hand Rule
Question: When is induced EMF maximum?
Answer: When motion is perpendicular to magnetic field