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Case Study: Read the following paragraph...

Case Study: Read the following paragraph and answer the questions:
In a beam of charged particles, not all particles move with the same speed. A charged porticle with mass m, charge q and speed v 'enters a region of space where.-electric field and magnetic fields are perpendicular to particle's velocity and to each other. Magnetic force is upward with magnitude qVB. When the total force is zero, there is no deflection om `(v) = (E) /( B) `

A cubical region of space filled with some uniform electric and magnetic field. An electron and positron enter opposite to each other with velocity v and - V respectively. Then:

A

Both particles gain or loose energy at same rate.

B

Motion of centre of mass is determined by B alone

C

Magnetic force causes acceleration on both particles equally

D

Motion of centre of mass is determined by Bond q.

Text Solution

Verified by Experts

The correct Answer is:
B
`vecv , vecE , vecB ` are constant There is no charge centre of mass of particle.
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