Answer:
true
Explanation:
when a ray of light travels from a less denser medium to a denser medium it tends to bend towards the normal.
Explanation:
Formula for path difference is as follows.
x = 2tn
and, refractive index (n) = 
Thickness is calculated as follows.
Thickness (t) = 
Area = 
= 
= 
= 
m
Now, the refractive index will be calculated as follows.
For drop, n =
For B drop, n = 
So, n = 
= 
= 1.5
Thus, we can conclude that index of refraction of the oil is 1.5.
Answer:
very little force causes friction
Explanation:
Work done=F *s*cos theta
Work done in this case can only be in the direction in which the electrons move.Thus cos theta is multiply to find the component of the force ( acting on an object doing work) which acts in the direction of propagation on movement of the object.Anyway,as in this case ,as magnetic field act only perpendicularly (at 90°) to electric fields(those are the electrons)no work is done.This is cause at 90°,there is no component of the magnetic field exiting of force in the direction of propagation of the electric field (electrons),as cos of 90 ° is 0, no work is done by the magnetic field.(as the whole product becomes zero regardless of the force or the displacement/distance
In a parallel circuit, the voltage across each of the components is the same, and the total current is the sum of the currents flowing through each component.
In a series circuit, every device must function for the circuit to be complete. If one bulb burns out in a series circuit, the entire circuit is broken.
