Electric field lines can never cross. what would crossed electric field lines indicate?

a field pointing in two directions
an attractive force on a charge
a nonuniform area of the field
a place where the field strength is zero

a field pointing in two directions

Explanation:

The lines of an electric field indicate the direction of the electric field, which corresponds to the direction of the force that a positve test charge would experience if placed in that electric field.

From this definition, we can clearly see that the field lines of the same electric field cannot cross. In fact, in that case we would have a point in the space where the electric field has two different directions: but this is impossible, because the force experienced by the positive test charge should have a precise direction. So, the lines of an electric field cannot cross.

atomic = no of protons.

mass number-atomic number = neutron number

can be answered using momentum.

momentum = p

p1= mass1 * velocity1

p1 = p2

therefore

p1 = 6kg * 4m/s

p1 = 24kgm/s

p2=m2 * v2

24 kgm/s = 7kg * v2

v2 = 24 kgm/s / 7kg

v2= 3.42 m/s