Despite current has a magnitude and a direction, like vectors, it is a scalar because it doesn't obey laws of vector addition. For instance, if we consider a junction of

in a circuit, and two currents entering this junction, we know that the resultant current is just the algebraic sum of the two currents, not the vector sum, so it is not a vector quantity.
It is a mechanical wave and cannot travel through a vacuum.
Answer:
10581.59 V
Explanation:
We are given that
Magnetic field=B=0.65 T
Speed of electron=
Charge on electron, 
Mass of electron,
We have to find the potential difference in volts required in the first part of the experiment to accelerate electrons.

Where V=Potential difference
Mass of electron
v=Velocity of electron
Using the formula


Hence, the potential difference=10581.59 V
Answer:
Answer to the question:
Explanation:
a. The pitch would get progressively lower (i.e., smaller frequency)
Explanation:
Since, the gravity in moon is 1/6th that of earth.
Therefore,
5m ladder if climed on moon will be equal to 1/6th that on earth .i.e 5×1/6=0.83m