A ball of mass m and charge q rotates in a vertical plane at the end of a string of length l = 3.6 m in a uniform upward electric field. If a horizontal velocity of (4k) m s⁻¹ is imparted at the highest position so that the string tension at the lowest position is 15 times its weight, find k. [The printed relation involving E and q is partially unreadable; refer to the source figure on PDF page 50. g = 10 m s⁻².]
Physics · Mixed Chapter
A ball of mass m and charge q rotates in a vertical plane at the end of a string of length l = 3.6 m in a uniform upward electric field. If a horizontal velocity of (4k) m s⁻¹ is imparted at the highest position so that the string tension at the lowest position is 15 times its weight, find k. [The printed relation involving E and q is partially unreadable; refer to the source figure on PDF page 50. g = 10 m s⁻².]