# (a) An electron moves along a circle of radius 1 m in a perpendicular magnetic field of strength 0.50 T. What would be its sped? Is it reasonable?(b) If a proton moves along a circle of the same radius in the same magnetic field, what would be its speed?

Given-

(a) For electron

Radius of the circle = 1 m

Magnetic field strength = 0.50 T

Now,

The radius of the circle is given by,

where,

m is the mass of a electron

v= velocity of the particle

B = magnetic force

q= charge on the particle = C

Speed of light is 3x108 m/s2

Here, the speed of the electron moving along the circle is greater than the speed of light, so it is not reasonable.

(b) For a proton,

The radius of the circle is given by,

where,

m is the mass of a proton

v= velocity of the particle

B = magnetic force

q= charge on the particle = C

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