SAQ 4.3 A horizontal wire carries a current l1= 80 A dc. A second parallel wire 20 cm below it must
carry how much current I2 so that it doesn't fall due to gravity? The lower wire has a mass of
0.12 g per meter of length.

the answer for apex is the lowest

d eras and periods

weight of the box is given as

here this is placed on the inclined of angle 42 degree

now this weight will have two components one is along the incline other is perpendicular to it

so here we need to apply a force parallel to incline opposite to its component of weight

so here the component of weight is given as

here we have

so it requires 75 n force to move it upwards