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A metallic loop is placed in a uniform magnetic field $\mathbf{B}$ with the planc of the loop perpendicular to $\mathbf{B}$. Under which condition given an emf will be induced in the loop "If the loop is ....."
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squeezed to a smaller area, rotated about one of its diameters
According to the question.
Given, A metallic loop is placed in uniform magnetic field B. Magnetic field $\mathbf{B}$ and metallic loop are perpendicular to each other. Then, if metallic loop is moved along $\mathbf{B}$ or rotated about its own axis. the net flux associated with it remains constant. Thus, no emf will be induced in these cases. However, when the loop is squeezed to a smaller area or rotated about one of its diameters. Then its flux changes. Thus, emf is induced. So, option (b) and (d) both are correct.
Given, A metallic loop is placed in uniform magnetic field B. Magnetic field $\mathbf{B}$ and metallic loop are perpendicular to each other. Then, if metallic loop is moved along $\mathbf{B}$ or rotated about its own axis. the net flux associated with it remains constant. Thus, no emf will be induced in these cases. However, when the loop is squeezed to a smaller area or rotated about one of its diameters. Then its flux changes. Thus, emf is induced. So, option (b) and (d) both are correct.
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