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An electron of mass 9.1 x 1031 kg moves with a sp...

An electron of mass 9.1 x 1031 kg moves with a speed of 2.0 x 106 ms1 round the nucleus of an atom in a Circular path of radius

6.1 x 1011 m. Calculate the centripetal force acting on the electron.
 

A.

7.7 x 1047 N

B.

6.0 x 108N

C.

3.0 x 1014N

D.

1.3 x 1026N

Correct answer is B

Centripetal force (Fr) = MV2r 

i.e. Fr = Mv2r 

= 9.1×1031×2.0×106×2.0×1066.1×1011

= (36.4×10196.1×1011) N

= 5.967 x 108

~ 6.0 x 108 N