Question

Calculate the work done in moving a charge of 3c from a point at 24v to a point at 12v.

Answer 1

length AB=200m=2R

time taken to complete one round=40 sec

let the starting point be A

in 140 sec or 2 min 20 sec number of rounds completed=14040=3.514040=3.5

distance traveled=3.5 * (2*ππ*R)=3.5*2*ππ*100 m=2200 m (approx)

displacement refers to change in position from the starting point.the final point is B

as after 3.5 revolutions(starting from A) the athlete will be at B.

displacement=200m

Answer 2

Your question

Calculate the work done in moving a charge of 3c from a point at 24v to a point at 12v.

• Too Easy

Your answer

Here ,

Given in the question →

• Charge = 3 C , which has to move in electric field from a point 'A' to point (say) 'B'

• To Calculate Work done (W) = ?

We use the Formula ,

Work done = Total charge x potential difference

• W = Q ( total ) x V

Here ,

• Q = Total charge = Given = 3 C

And ,

• V = Potential difference = ( 24 - 12 ) V
• = 12 V

So the word done in moving the charge from A ( 24V ) to B ( 12 V ) will be ,

• W = 3 x 12
• W = 36 joules

Work done = 36 joules.