Question

the gravitational field in a region is given by l 2i+3j (n/kg) then work done by external agent to shift a particle of mass 5 kg from a point (0,0) to a point (1m,2m) slowly 1 - 20j , 2 - 40j , 3 - 60j , 4 - 80j​

Answer 1

Answer:

The force on the particle will be

F=mE=(2i+3j)N

Direction of force is along line of slope m  

1

​  

=  

2

3

​  

 

Now, the direction of motion is along line of slope m  

2

​  

=−  

3

2

​  

.

Since m  

1

​  

m  

2

​  

=−1, hence force and displacement are perpendicular ro each other and thus the work done is 0.

Answer is 0J.

Explanation: