### Discover the least value of initial velocity

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##### Reference no: EM133770

Question1

A man of mass 700kg stands in a lift on a set of weighing scales. The scale is calibrated in newtons. Assume a value of 10N/kg for g,

(a) What weight will scale register when the lift is static?

(b) What weight will scale be register when the lift accelerate downwards at 10m/s square?

(c) What weight will scale register when the lift accelerate upward at 10m/s square?

Question2

A negatively charged particle having magnitude of charge q = 0.1 C and mass m = 200 gm moves with speed v = 10m/s 4T making angle is equal to enters a region having magnetic field B 60° with X axis. The direction of magnetic field is out of X–Y plane. A convex lens is placed at a distance 14.3 m from origin. Region of magnetic field starts from origin and extends till lens. Focal length of lens is 50 cm. Take X-axis as principle axis.

Discover the least value of initial velocity of charge so that image formed is virtual.

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