Question

In a region of space, cathode rays move along positive z-axis and a uniform magnetic field is applied along x-axis. If cathode rays pass without deviation, the direction of electric field will be along:

• A. negative x-axis
• B. positive y-axis
• C. negative y-axis
• D. positive z-axis

Answer 1

The correct option is D positive z-axis

Magnetic force is along +Y axis
the charge is -ve. Therefore, electric field should be along +Y axis