Let vecE and vecB denote electric and magnetic fields in a frame S and vecE and vecB in another frame S moving with respect to S at a velocity vecv. Two of the following equations are wrong. Identify them.

In a certain region of space, electric field vecE and magnetic field vecB are perpendicular to each other. An electron enters in the region perpendicular to the direction of both vecB & vecE and moves undeflected. Find the velocity of electron.

The force on a charged particle due to electric and magnetic fields is given by vecF=qvecE+qvecvXvecB . Suppose vecE is along the X-axis and vecB along the Y-axis. In what direction and with what minimum speed v should a positively charged particle be sent so that the net force on it is zero?

A particle is found to be at rest when seen from a frame S_(1) and moving with a constant velocity when seen from another frame S_(2) . Select the possible options :

Consider an electron travelling with a speed V_(0) and entering into a uniform electric field vecE which is perpendicular to vecV_(0) as shown in the Figure. Ignoring gravity, obtain the electron 's acceleration velocity and position as functions of time.

Write the expression in a vector from for the Lorentz magnetic force vecF due to a charge moving with velocity vecv in a magnetic field vecB What is the direction of force.

A particle having mass m and charge q is released from the origin in a region in which electric field and magnetic field are given by vecB =- B_0vecJ and vecE - E_0 vecK. Find the speed of the particle as a function of its z-coordinate.

Classify the following properties of the waves into de Broglie wave, e.m wave and sound wave. i. Associated with the moving moving particle ii. Longitudinal wave iii. Electric field and magnetic field are perpendicular to each other iv. Can produce photoelectric effect v. Wavelength is inversely proportional to mass of the moving particle vi. Velocity in vacuum is 3xx10^(8)m//s

Take a small stone. Hold it in your hand. We know that the force gravity due to the earth acts on each and every object. When we were holding the stone in our hand, the stone was experiencing this force, but it was balanced by a force that we were applying on it in the opposite direction. As a result, the stone remained at rest. Once we release the stone from our hands the only force that acts on it is the gravitational force of the earth and the stone falls down under its influence. Whenever an object moves under the influence of the force of gravity alone, it is said to be falling freely. Thus the released stone is in a free fall. In free fall, the initial velocity of the object is zero and goes on increasing due to acceleration due to gravity of the earth. During free fall, the frictional force due to air opposes the motion of the object and buoyant force also acts on the object. Thus, true free fall is possible only in vacuum. For a freely falling object, the velocity on reaching the earth and the time taken for it can be calculated by using Newton's equations of motion. For free fall the initial velocity u=0 and the acceleration a=g . Thus, we can write the equations as v="gt",s=1/2"gt"^(2),v^(2)=2gs For calculating the motion of an object thrown upwards, acceleration is negative, i.e. in a direction opposite to the velocity and is taken to be -g. The magnitude of g is the same but the velocity of the object decreases due to -ve acceleration. The moon and the artificial satellites are moving only under the influence of the gravitational field of the earth. Thus they are in free fall. What is the initial velocity and what is the effect of gravitational acceleration on the object in free fall?

Take a small stone. Hold it in your hand. We know that the force gravity due to the earth acts on each and every object. When we were holding the stone in our hand, the stone was experiencing this force, but it was balanced by a force that we were applying on it in the opposite direction. As a result, the stone remained at rest. Once we release the stone from our hands the only force that acts on it is the gravitational force of the earth and the stone falls down under its influence. Whenever an object moves under the influence of the force of gravity alone, it is said to be falling freely. Thus the released stone is in a free fall. In free fall, the initial velocity of the object is zero and goes on increasing due to acceleration due to gravity of the earth. During free fall, the frictional force due to air opposes the motion of the object and a buoyant force also acts on the object. Thus, true free fall is possible only in vacuum. For a freely falling object, the velocity on reaching the earth and the time taken for it can be calculated by using Newton's equations of motion. For free fall the initial velocity u=0 and the acceleration a=g . Thus, we can write the equations as v="gt",s=1/2"gt"^(2),v^(2)=2gs For calculating the motion of an object thrown upwards, acceleration is negative, i.e. in a direction opposite to the velocity and is taken to be -g. The magnitude of g is the same but the velocity of the object decreases due to -ve acceleration. The moon and the artificial satellites are moving only under the influence of the gravitational field of the earth. Thus they are in free fall. Which force acts on the stone in free fall after you release it?