Answer:
Explanation:
Ohm's law is define by the formula
V = IR where I is current in A, R is resistance in ohms
to calculate the resistance we use the formula above
I = 185 mA / 1000 = 0.185 A
case 1, R = V / I = 12 V / 0.185 A = 64.86 ohms
case 2, R = V / I = 90 / 1.25 A = 72 ohms
a) the resistor is not ohmic since there is no linear relationship between R and V ( as voltage increases, resistance ought to also increase)
b) rate of Joule heating in the case 1, P, power = IV = 0.185 A × 12 = 2.22 W
case 2, P = IV = 1.25 A × 90 V = 112.5 W
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Answer: 50 km, 0, 27.78 m/s
Explanation:
Given
Circumference of the track is 
Speed of car is 
Car drives for 
(a)Distance traveled is

(b)displacement of the car
It can be observed that 12.5 is a multiple of 50, that is, 50 km can be interpreted as 4 complete rounds of the track.
Therefore, the displacement of the car is zero.
(c)To convert kmph to m/s, multiply the entity by 

Answer:
equivalent power = 6.60 ×
W
Explanation:
given data
coal train length = 1.5 km = 1500 m
contain = 120 cars
holding= 110 tonnes of coal each
train traveling speed = 100 km/h = 27.78 m/s
to find out
equivalent power in watts
solution
we take here energy produce by coal is 27 ×
J/kg
and here total coal = 120 × 110 × 10³ kg
sop here energy produce by total coal is
energy produce by total coal = 27 ×
× 120 × 110 × 10³
and time required to cross that distance is
time =
time =
time = 53.99 sec
so here equivalent power will be
equivalent power =
equivalent power =
equivalent power = 6.60 ×
W
The point P lies at a linear distance 1 m from the corner. Magnetic field due to current in wire Magnetic field due to current in wire. Applying Right hand thumb rule, the magnetic field at P is perpendicular to xy plane and into the plane of drawing (i.e. negative z-direction).