can u explain how it is possible????????

hey now we have got it mathematically but it can be obtained  conceptually  as we know that when a current is allowed to flow through a closed loop then the magnetic field at the center even if the current is diff in the wires is =0 like even when the water flows smoothly or from diff cross sections of pipe the quantity of the water is the same.

hope u got it as it can be useful for objective.

yes i also think that the ans could be the 2nd one bcoz with the translational motion of the sphere it also has initial ang vel which will also give it some vel

tell me if i m correct?

since the dir. of the frictional force=mg is upward for the block to be in eqlm.

also in stable eqlm the net force=0

therefore F=N

since in the fig the F is acting in the line of C.M. so torque by it =0

but N will produce a torque to balance the torque by the frictional force

so N will also shift its position such that it produce anticlockwise torque to balance the clockwise torque by the frictional force

hope u got it.

yes the locus of the points will be cycloid which can be found conceptually but to find the radius of cuvature of this is a difficult ask 

can u plz give the options  as it helps in thinking in the right diection?

no we dont need the length of the side of the hexagon

if 1 side is connested to the battery then the circuit will be divided into 2 parts one with the 5 sides having net resistance 5 x 4=20 and the other having the resistance 4 ohm but the current is in opp. dir. with respect to each other

also they r in parallel combination to each other.

so the net current 24 x 3 /10 =7.2 ampere   {R_net=20 x 4/6=10/3}

the current will be 6 A in the single side and 1.2 A in the 5 sides

the field due to the 5 sides will be opp. to the 1 side .

therefore net magnetic field =k{1.2 x 5 /d-6/d}   where k is a constant

                 B_centre=0

hope u got it.

now dude listen to my poor logic which doesnot give the ans

when the conductor C is brought close to A there will be a induced charge -q on C which will apply the force of attraction  on A

the same event will repeat itself in case of B also so the net force of repulsion will increase i.e. the new force of repulsion will be greater than F.

Also u have not told for how much time the sphere C is kept close to the spheres so we cannot find the distabce the spheres moves due to the force of attraction.

tell me if i m correct?

then tell me the correct soln plz

whats the ans man?

i think it is either 8F/3 or 7F/6

sorry for the ans 4F i commited a big blunder in that

is the ans 8F/3

is the ans 4F

tell me if i m correct i will explain

@islahul_101 it was a good question u compelled me think higher so i m rating u

but friend it is not about sound energy only some energy is also lost as heat energy to the surroundings