Like poles repel
Unlike poles attract
Lie freely to their poles
When a conductor cuts through the magnetic field lines, an electromotive force is induced by Faradays law
Answer:
(a) 
(b) 
Explanation:
(a)
The result obtained by multiplying two values which are having different precision has to express in the precision of the least precise number. So among the given values 4.79 is the least precise value; hence round off the result to 3 significant figures. For a rectangular room, area is a product of length and width, here, l is length and b is width/breadth
(b)
Following the same rules mentioned in part a of the question
For circular shaped bedroom, area 
The diameter of the circular room is 6.32, this is the least precise value used to calculate the area, so round off the final result to 3 significant figures
Answer:
15volts
Explanation:
According to ohms law, the current passing through a metallic conductor at constant temperature is directly proportional to the potential difference across its ends. Mathematically,
E = IRt
E is the source voltage
I is the total current
Rt is the effective resistance.
Before we can get the voltage drip across a load, we must know the current flowing through it.
Given E = 90V
Rt = 5+10+15 (for a series connection)
Rt = 30Ω
I = E/Rt
I = 90/30
I = 3A
Note that In a series connected circuit, same current but different voltage flows through the circuit.
Therefore the current in the 5Ω resistor is also 3A.
To get the voltage drip across the 5Ω resistor we use the formula
V=IR
V = 3(5)
V = 15volts
Answer:
The answer is "A raised, flat-surfaced area bound on one or more sides by cliffs or steep slopes."
Explanation:
Heat flux (i) = k.a.temp variation/d
i = 250 J/s or 250w ; d = 2.1 x 10^-3m ; A = 1.9m^2 ; K (Body Fat) = 0.2W/m.Kelvin ; Temp. Var. (Delta T) = ?
-> 250 = 0.2 x 1.9 x deltaT/2.1 x 10^-3
-> 250 x 2.1 x 10^-3 = 0.38 x deltaT
-> 525 x 10^-3 = 38x10^-2 x deltaT
-> deltaT = 525 x 10^-3/ 38 x 10^-2
-> deltaT = 13.81 x 10^(-3 - (-2))
-> deltaT = 13.81 x 10^-1
-> deltaT = 1.381 K
