Answer:
It would be C because quantity means numbers
Answer:
i think its second law of motion.
Explanation:
When you take a long piece of wire, form it into a coil of several loops, and run a current through it, you get a magnetic field that runs straight along the axis of the coil.
This arrangement of a conductor and the current through it is called a "<em>solenoid</em>". <em>(C) </em>
Answer:

Explanation:
Given data:
particle mass = 0.923 g
particle charge is 4.52 micro C
speed of particle 45.7 m/s
In this particular case, coulomb attraction will cause centrifugal force and taken as +ve and Q is taken as -ve

solving for Q WE GET



where

Vector quantity is defined by direction as well as magnitude both
so now lets discuss all option
1) distance = it is total path length between two points so there is no direction needed in it so it is scalar
2) Speed = it is ratio of total distance covered and total time, so it also do not require any direction.
<em>3)velocity = it is ratio of displacement and time, and displacement is always given with direction so velocity is a vector quantity</em>
4) time = time is the measurement of the interval of two events and we do not require any direction in it so its a scalar quantity.