Answer:
The current would stop
Explanation:
Electric currents are interesting because they carry little to no momentum. As soon as you remove a power source, the whole current halts.
Explanation:
When there is no change in chemical composition of a substance then it is known as physical change.
When we say that mass is conserved during a physical change then it means that total mass of the substance or object will remain the same from beginning till the end.
For example, a metal box of mass 20 grams is beaten with hammer. Its shape will change which is a physical change and after beaten with the hammer its mass still remains 20 grams.
<h2>
Answer:</h2>
<em>The balloon will attach to the wall because the balloon's negative charges will drive the electrons in the wall to shift to the other side of their atoms, leaving the wall's surface positively charged.</em>
Answer:
0.0027 V
0.000625 V
EMF doubles
Explanation:
= Initial magnetic field = 0.2 T
= Final magnetic field = 1.4 T
t = Time taken = 1.6 s
A = Area
N = Number of turns
Induced emf is given by
Emf is 0.0027 V
= Initial area =
= Final area =
B = 0.5 T
Induced emf is given by
The new emf in the loop will be 0.000625 V (magnitude)
If the number of turns is doubled then the emf doubles as
Answer:
U= 4.1×10^{-3} J
Explanation:
Given:
Young's modulus E= 2.5×10^5 N/m^2
thickness of material L_o =3.0 mm
Area A= 0.50 cm^2
ΔL= 1.0 cm
The potential energy is given by
U= 1/2FΔx
therefore
now putting values we get
U= 4.1×10^{-3} J