In a region of space, a uniform magnetic field of induction B is established everywhere pointing in the positive x-direction. A rigid plane is fixed perpendicular to the x-axis at a certain distance from the origin. A particle of mass m and charge q is projected from the origin with its velocity vector ü in the x-y plane making an angle 0 with the x- axis as shown in the figure. After an elastic collision with the plane, the particle loses half of its charge and then returns to the point of projection mssing the x-axis n times. Find distance of the plane from the origin. Ans: 4nmucose y4 98

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!