A student builds a simple circuit with a single resistor with resistance RRR and measures an electric potential difference \Delta VΔVdelta, V across the resistor. Then, the student replaces the resistor with a new one of resistance \dfrac{R}{2} 2
R
​
start fraction, R, divided by, 2, end fraction and keeps the electric potential difference the same.
What is the current I_2I
2
​
I, start subscript, 2, end subscript through the new circuit in terms of the original current, I_1I
1
​
I, start subscript, 1, end subscript?

i believe it is b. what was the cause of the big bang

hope this !

one person pulls 90n one way and the other has 100n pulling the other way.

so the net force = 90 - 100 = -10n,

or the ans can be 10n if the picture shows -90n and 100n instead.

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

                                              ⇒      

here   k is the proportionality constant whose value is 1.

                                                            [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.