NEET Physics MCQs

A charged particle of mass $m$ and charge $q$ moves in a uniform magnetic field $B$ with a velocity $v$ perpendicular to the field. The particle executes circular motion with radius $r$. If the velocity of the particle is doubled, what is the new radius of the circular path?

A proton moving with velocity $v$ enters a region of uniform magnetic field $B$ perpendicular to its velocity. The radius of the circular path it follows is given by:

A proton moving with velocity $v$ enters a region of uniform magnetic field $B$ perpendicular to its velocity. Which of the following changes if the proton's velocity is doubled?

A mass $m$ is attached to a thin wire and whirled in a vertical circle. At what point in the circular path is the tension in the wire most likely to exceed the wire's breaking strength?

A stone of mass $0.5$ kg is tied to a string of length $1$ m and whirled in a vertical circle. What is the minimum speed required at the bottom of the circle to ensure the string remains taut at the top?

A bucket filled with water is swung in a vertical circle. The mass of the water is $m$. Which of the following is the correct expression for the minimum speed at the highest point so that the water does not spill out?

A bob of mass $m$ is attached to a string of length $l$ and is rotated in a vertical circle. At the highest point of the circular path, the tension in the string is zero. What is the speed of the bob at this point?

In a vertical circular motion of a mass attached to a string, where is the kinetic energy of the mass at its maximum?

What is the minimum velocity at the bottom of a vertical loop of radius $R$ required for a body of mass $m$ to complete the loop?

A roller coaster car of mass $m$ enters a vertical loop of radius $R$. What minimum speed must it have at the bottom of the loop to ensure it doesn't fall off at the top?