Answer :
Mass of the particle m=1.48 g=1.48×10−3 kgm=1.48 g=1.48×10−3 kg
Electric field E=670 N/CE=670 N/C directed downwards.
Charge Particle in an Electric Field
The electric force must act as opposite to the weight of the particle
qE= mgxqE = mg
q = mgEq= mgE
q= 1.48×10−3 kg × 9.8 m/s 2670 N/C
q=2.16×10−5 Cq=2.16×10−5 C
As the force is upwards and an electric field is downwards it means the charge on the particle is negative.
q=−2.16 × 10−5 Cq= −2.16 × 10−5 C
In the second case for a proton
qE= mgqE= mg
E= mgqE= mgq
E= 1.67×10−27 kg × 9.8 m/s21.6×10−19 C
E= 1.023×10−7 N/C
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