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(B, D) According to Faraday's law of electromagnetic induction, an emf is induced in a loop whenever there is a change in the magnetic flux $(\Phi_B =

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the loop is deformed from the original shape

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(B, D) According to Faraday's law of electromagnetic induction, an emf is induced in a loop whenever there is a change in the magnetic flux $(\Phi_B = \vec{B} \cdot \vec{A} = BA \cos 	heta)$ linked with it.$1$. If the loop is translated parallel to itself in a uniform magnetic field, the flux remains constant, so no emf is induced.$2$. If the loop is rotated about one of its diameters, the angle $	heta$ between the area vector and the magnetic field changes, causing a change in flux, thus inducing an emf.$3$. If the loop is rotated about its own axis (which is parallel to the field), the angle $	heta$ remains constant, so no emf is induced.$4$. If the loop is deformed, the area $A$ changes, which also changes the magnetic flux, thus inducing an emf.Therefore, options $B$ and $D$ both lead to an induced emf.

$A$ conducting loop in the form of a circle is placed in a uniform magnetic field with its plane perpendicular to the direction of the field. An emf will be induced in the loop, if

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