NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 314 - 317 of 2320

Question

A stone of mass 1 kg tied to a light inextensible string of length L = 10/6 m is whirling in a circular path of radius L in a vertical plane. If the ratio of the maximum tension in the string to the minimum tension in the suing is 4 and if g is taken to be 10m/sec ², the speed of the stone at the highest point of the circle is

Question

In the rectangle shown below, the two corners have charges q ₁ = -5 μC and q ₂ = +2.0 μC. The work done by external agent in moving a charge q = +3.0 μC slowly from B to A is

(Take l/4π ₀ = 10 ¹⁰ Nm ² /C ²)

Question

A boy standing on a weighing machine observes his weight as 200 N. When he suddenly jumps upwards, his friend notices that the reading increased to 400 N. The acceleration by which the boy jumped will be

Question

A swimmer can swim in still water at a rate 4 km/h. If he swims in a river flowing at 3 km/h and keeps his direction (w. r. t. water) perpendicular to the current. Find his velocity w. r. t. the ground.