Question

Given below are two statements:

• Statement I: The electric force changes the speed of the charged particle and hence changes its kinetic energy; whereas the magnetic force does not change the kinetic energy of the charged particle.
• Statement II: The electric force accelerates the positively charged particle perpendicular to the direction of the electric field. The magnetic force accelerates the moving charged particle along the direction of the magnetic field.

In light of the above statements, choose the most appropriate answer from the options given below.

Options

• Both statements I and Statement Il are correct.

• Both statements I and Statement II are incorrect.

• Statement I is correct but statement II is incorrect.

• Statement I is incorrect but statement II is correct.

Answer 1

Statement I is correct but statement II is incorrect.

Explanation:

Statement I is correct, whereas statement II is incorrect, because the electric field accelerates particles in the direction of the electric field, i.e.,`vecF = qvecE = mveca`, whereas the magnetic field accelerates particles perpendicular to the magnetic field, i.e.,`vecF = q vecv xx vecB = mveca`.