A charged particle enters a magnetic field at 90° to the field. Its kinetic energy MCQ with Answer and Explanation

Explanation:
KE = ½mv², ΔKE/KE = Δm/m + 2 Δv/v = 1% + 4% = 5%.

Explanation:
T ∝ √L, L'=4L => T' = √4 T = 2×2 = 4 s.

Explanation:
A Venturimeter consists of a converging pipe, a narrow throat, and a diverging pipe. As fluid passes through the constricted throat, its velocity increases. According to Bernoulli's principle, this increase in kinetic energy must be accompanied by a strictly corresponding decrease in fluid pressure. By measuring this pressure difference, the flow rate can be precisely calculated.