Answer:
Current, I = 3.57A
Explanation:
A current of I amperes means that I Coulombs of charge flows through the conductor (heating coil) per second.
Therefore, in time t, the total charge (Q) passing through any point in which the current (C) flows will be given by the equation;
Q = It
Where; Q is the charge in coulombs; I is the current in amperes; t is the time in seconds.
From the question, we were given the following parameters;
Q = 25C, t= 7secs and I =?
From the equation, Q = It
We make current, I the subject of formula;
Thus, I = Q/t
Substituting into the equation;
I = 25/7
I = 3.57Amp.
Answer:
False
Explanation:
Vector has a magnitude and direction.
A scalar is just a magnitude or size.
Answer:
0.15 mV
Explanation:
In order to exhibit wave nature, the de Broglie wavelength of the electron must be of the same size of the diameter of the pinhole, therefore:
The de Broglie wavelength of an electron is
where
is the Planck constant
is the mass of the electron
v is the electron's speed
Therefore, the electron's speed must be
When accelerated through a potential difference 
, the kinetic energy gained by the electron is equal to the change in electric potential energy, therefore
where
is the magnitude of the charge of the electron
So, we can find the potential difference needed:
Conduction, since the iron is in direct contact with the clothes.
