Physics-
General
Easy
Question
A particle carrying a charge equal to 100 times the charge on an electron is rotating per second in a circular path of radius 0.8 metre. The value of the magnetic field produced at the centre will be (
= permeability for vacuum)
The correct answer is:
Related Questions to study
Physics-
An infinitely long straight conductor is bent into the shape as shown in the figure. It carries a current of i ampere and the radius of the circular loop is r metre. Then the magnetic induction at its centre will be
An infinitely long straight conductor is bent into the shape as shown in the figure. It carries a current of i ampere and the radius of the circular loop is r metre. Then the magnetic induction at its centre will be
Physics-General
Physics-
A length L of wire carries a steady current /. It is bent first to form a circular plane coil of one turn. The same length is now bent more sharply to give a double loop of smaller radius. The magnetic field at the centre caused by the same current is
A length L of wire carries a steady current /. It is bent first to form a circular plane coil of one turn. The same length is now bent more sharply to give a double loop of smaller radius. The magnetic field at the centre caused by the same current is
Physics-General
Physics-
Assertion : The height attained by a projectile is twenty five percent of range, when projected for maximum range.
Reason : The height is independent of initial velocity of projectile.
Assertion : The height attained by a projectile is twenty five percent of range, when projected for maximum range.
Reason : The height is independent of initial velocity of projectile.
Physics-General
Physics-
A cricket ball is hit at 30
with the horizontal with kinetic energy K. The kinetic energy at the highest point is :
A cricket ball is hit at 30 with the horizontal with kinetic energy K. The kinetic energy at the highest point is :
Physics-General
Physics-
A small body of mass m slides down from the the top of a hemisphere of radius r. The surface of block and hemisphere are frictionless. The height at which the body lose contact with the surface of the sphere is :
A small body of mass m slides down from the the top of a hemisphere of radius r. The surface of block and hemisphere are frictionless. The height at which the body lose contact with the surface of the sphere is :
Physics-General
Physics-
A particle is moving on a circular path of radius r with uniform velocity null. The change in velocity when the particle moves from P to Q is null :
A particle is moving on a circular path of radius r with uniform velocity null. The change in velocity when the particle moves from P to Q is null :
Physics-General
Physics-
For a body moving in a circular path, a condition for no skdding if µ is the coefficient of friction, is :
For a body moving in a circular path, a condition for no skdding if µ is the coefficient of friction, is :
Physics-General
Physics-
The trajectory of a particle moving in vast maidan is as shown in the figure. The coordinates of a position A are (0, 2). The coordinates of another point at which the instantaneous velocity is same as the average velocity between the points are :
The trajectory of a particle moving in vast maidan is as shown in the figure. The coordinates of a position A are (0, 2). The coordinates of another point at which the instantaneous velocity is same as the average velocity between the points are :
Physics-General
Physics-
The path of a projectile in the absence of air drag is shown in the figure by dotted line. If the air resistance is not ignored then which one of the path shown in the figure is appropriate for the projectile :
The path of a projectile in the absence of air drag is shown in the figure by dotted line. If the air resistance is not ignored then which one of the path shown in the figure is appropriate for the projectile :
Physics-General
Physics-
Figure shows four paths for a kicked football. Ignoring the effects of air on the flight, rank the paths according to initial horizontal velocity component, highest first :
Figure shows four paths for a kicked football. Ignoring the effects of air on the flight, rank the paths according to initial horizontal velocity component, highest first :
Physics-General
Physics-
A solid disc rolls clockwise without slipping over a horizontal path with a constant speed null. Then the magnitude of the velocities of points A, B and C (figure) with respect to a standing observer are respectively:
A solid disc rolls clockwise without slipping over a horizontal path with a constant speed null. Then the magnitude of the velocities of points A, B and C (figure) with respect to a standing observer are respectively:
Physics-General
Physics-
A small block is shot into each of the four traks as shown below. Each of the tracks rises to the same height. The speed with which the block enters the track is the same in all cases. At the highest point of the track, the normal reaction is maximum in :
A small block is shot into each of the four traks as shown below. Each of the tracks rises to the same height. The speed with which the block enters the track is the same in all cases. At the highest point of the track, the normal reaction is maximum in :
Physics-General
Physics-
A particle P is sliding down a frictional hemispherical bowl. It passes the point A at t = 0. At this instant of time, the horizontal component of its velocity null. A bead Q of the same mass as P is ejected from A at t = 0 along the horizontal string AB (figure) with the speed null. Friction between the bead and the sting may be neglected. Let tP and tQ be the respective time taken by P and Q to reach the point B. Then :
A particle P is sliding down a frictional hemispherical bowl. It passes the point A at t = 0. At this instant of time, the horizontal component of its velocity null. A bead Q of the same mass as P is ejected from A at t = 0 along the horizontal string AB (figure) with the speed null. Friction between the bead and the sting may be neglected. Let tP and tQ be the respective time taken by P and Q to reach the point B. Then :
Physics-General
Physics-
A string of length L is fixed at one end and carries a mass M at the other end. The string makes null revolutions per second around the vertical axis through the fixed end as shown in the figure, then tension in the string is :
A string of length L is fixed at one end and carries a mass M at the other end. The string makes null revolutions per second around the vertical axis through the fixed end as shown in the figure, then tension in the string is :
Physics-General
Physics-
A stone is thrown at an angle 
to the horizontal reaches a maximum height H. Then the time of flight of stone will be :
A stone is thrown at an angle to the horizontal reaches a maximum height H. Then the time of flight of stone will be :
Physics-General
