Aproton travels at a speed of 2.0 × 106 meters/second. its velocity is at right angles with a magnetic field of strength 5.5 × 10-3 tesla. what is the magnitude of the magnetic force on the proton? a. 1.0 × 10-15 newtons b. 1.8 × 10-15 newtons c. 2.1 × 10-16 newtons d. 5.5 × 10-16 newtons

The answer is B : F = 1.8 X 10 ∧ -15

Given:

Velocity of the proton: 2.0 × 10∧6 m/sec                                      

Magnetic field strength(B): 5.5 × 10∧-3 tesla

Now it is given that velocity and the magnetic field are at 90 degree.

Also Magnetic force F= qvBsin∅                                                       

where F is the magnetic force                                                                    

q is the charge of the proton  which is equal to  1.602x10∧-19 coloumbs

∅ is the angle between the v and B.                                                          

v is the velocity of the proton                                                                

B is the magnetic field                                                              

Substituting the values  we get

F = 1.602 x 10 ∧-19 × 2.0 × 10∧6 × 5.5 × 10∧-3 Sin 90

F= 17.6 x 10 ∧-16  N                                                                                        

F= 1.76 x 10∧-15  N

Rounding off we get  F = 1.8 X 10 ∧ -15 N

PLATO ANSWERS

1.8 × 10^6-15 newtons

a and c

c is 100% but i am confused in a

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