Answer:
William Gilbert
Explanation:
first described the Earth as a giant dipole magnet 400 years ago. But, as Rod Wilson recounts, he did far more than this.
Answer:
Current needed = 704A
Explanation:
Using the fomula; torque(τ) = (I)(A)(B)Sinθ
Where B = uniform magnetic field
I = current and A = Area
Diameter = 19cm = 0.19m so, radius = 0.19/2 = 0.095m
Area(A) = πr^(2) = πr^(2)
= π(0.095)^(2) = 0.0284 m^(2)
Now, B(earth)= 5x10^-5 T
While, we can ignore the angle because it's insignificant since the angle of the wire is oriented for maximum torque in the earth's field.
Now, if we arrange the formula to solve for charge (I):
I = (τ)/(A)(B)
I = (1.0x10^-3) / (0.0284)(5x10^-5)
I = 704A
Work done=mgh
W=force*height
W=5N*0.50mts
W=2.5joule
Answer:
we will have induced magnetic field towards us
now in order to induce the magnetic field towards us we must have induced current in the loop and its direction is counterclockwise.
Explanation:
As per lenz law we know that the rate of change in magnetic flux linked with the closed loop will induced EMF in the loop and the direction of this induced current in the loop will always oppose the causes due to which it is induced
Here we know that magnetic field is straight towards us and it start decreasing with time
So we can say that flux linked with the coil will also decrease with time
Now as per lenz law the induced magnetic field of the loop is in such a direction that it will increase the magnetic flux in the coil.
So we will have induced magnetic field towards us
now in order to induce the magnetic field towards us we must have induced current in the loop and its direction is counterclockwise.
