Question

A conducting loop is placed in a uniform magnetic field with its plane perpendicular to the field. An emf is induced in the loop if
A It is rotated about its axis
B It is rotated about a diameter
C It is not moved
D It is given translational motion in the field

Answer 1

Hint: The generation of an electromotive force across an electrical conductor in a changing magnetic field is known as electromagnetic or magnetic induction. Induction was discovered in 1831 by Michael Faraday, and it was mathematically defined as Faraday's law of induction by James Clerk Maxwell. The direction of the induced field is described by Lenz's law. Faraday's law was eventually extended to become the Maxwell–Faraday equation, one of Maxwell's four electromagnetic equations.

Complete step by step solution:
Induced emf is a kind of electromagnetic induction.
It's the development of a potential difference in a coil as a result of changes in the magnetic flux passing through it. When the flux connecting with a conductor or coil changes, electromotive Force, or EMF, is said to be induced.
According to Faraday's law of induction, eddy currents are loops of electrical current induced within conductors by a changing magnetic field in the conductor. Within conductors, eddy currents flow in closed loops in planes perpendicular to the magnetic field. A time-varying magnetic field generated by an AC electromagnet or transformer, for example, or relative motion between a magnet and a neighbouring conductor might induce them inside nearby stationary conductors. The size of the current in a particular loop is related to the magnetic field intensity, loop area, and flux rate of change, and inversely proportional to the material's resistivity.
Only when the magnetic flux in the loop changes does an emf occur. When the loop is revolved around a diameter, this is feasible.
Hence option B is correct.

Note: Eddy currents in non-zero resistivity conductors produce both heat and electromagnetic forces. Induction heating may be done using the heat. Electromagnetic forces can be utilised to levitate, move objects, or provide a powerful braking effect. Eddy currents can also have negative consequences, such as power loss in transformers. Thin plates, conductor lamination, and other features of conductor form are used to reduce them in this application.