A charged particle travels undeflected through perpendicular electric field and

Question

A charged particle travels undeflected through perpendicular electric field and magnetic fields whose magnitudes are 1000N/C and 20mT , respectively. Part A Find the speed of the particle if it is a proton. Express your answer using two significant figures. v = _____ m/s Part B Find the speed of the particle if it is an alpha particle. (An alpha particle is a helium nucleus-a positive ion with a double positive charge of +2e.) Express your answer using two significant figures. v = __________ m/s

Explanation / Answer

is undefeclted

q v B = q E

so

v B = E

v = E/B = 1000/20.0E-3=50000 m/s

b) same answer 50000 m/s

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