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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > A insulated square frame ABCD of side a is able to rotate about one of its side taken as positive z-axis. A magnetic field B is present in the region given by vecB=B_(0)hatj. A small block of mass m and charge q movable along side CB is initially near C, when frame lies in x-z plane. Now, frame is rotated by constant angular velocity omega about z-axis. Whole system lies in gravity free space. If after time t block reaches point B, find B_(0) in terms of t.

A insulated square frame ABCD of side a is able to rotate about one of its side taken as positive z-axis. A magnetic field B is present in the region given by vecB=B_(0)hatj. A small block of mass m and charge q movable along side CB is initially near C, when frame lies in x-z plane. Now, frame is rotated by constant angular velocity omega about z-axis. Whole system lies in gravity free space. If after time t block reaches point B, find B_(0) in terms of t.

In a hydrogen atom the electron moves around the nucleus in a circular orbit of radius 5×10 −11 m. Its time period is 1.5×10 −16 s. The current associated with the electron motion is (Charge of electron is 1.6×10 −19 C)