The graph between the strength of the magnet(number of paper clips picked) and battery is approximately a straight line.
For 25 coil, with increase of 1.5 V battery voltage, the electromagnet picks about 5 more clips. So, for a 7.5 V battery, it would pick about 30 paper clips.
For 50 coil, with increase of 1.5 V battery voltage, the electromagnet picks about 15 more clips. So, for a 7.5 V battery, it would pick about 30 paper clips.
Answer:
Explanation:
The path of waves reaching directly and through reflection from ionosphere will form a isosceles triangle.
Let the height be h . This will be height of a triangle of equal side whose base is of length 32 km. we shall calculate the length of one side of this triangle .
this length be l
l² = 16² + h²
l = √(256 +h² )
2l = 2√(256 +h² )
path difference = 2l - 32 km
For destructive interference
path difference = wavelength /2 for minimum height .
2l - 32 = .344/2
2√(256 +h² )- 32 = . 172
2√(256 +h² ) = 32.172
4(256 +h² ) = 1035
(256 +h² ) = 258.76
h² = 2.76
h = 1.66 km
False (unless you want to put on a lot of extra body mass)
<span>The gravitational force is 10 N down, and the force of air resistance is 1 N up.
The 1 N up exactly cancels one of the 10 N down.
What's left is the net force on the ball . . . . . 9 N down.</span>
Answer:
Double the voltage across it.
Explanation:
From Ohm's Law, we have the relation, as follows:
Voltage = (Current)(Resistance)
If we keep the resistance of the wire as a constant, then we get the relation between voltage and current as follows:
Voltage = (Constant) * Current
Voltage α Current
This shows that the current has a direct proportionality with the voltage. So, if we want to double the current flowing through a piece of metal wire, then we must <u>Double the voltage across it.</u>
It can be confirmed by formula as:
V = IR
Now, doubling the voltage:
V' = 2 IR
substituting value of IR = V:
V' = 2 V