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Answer : 2 (two)
For every O ion, two Na ions are needed to balance charges.
Answer:
radius of curvature is 1.2 m
Explanation:
given data
distance u = 30 cm
to find out
radius of curvature
solution
we know radius of curvature is double of focal length
so we find focal length
lens formula for focal length
1/f = 1/u + 1/v ..............................1
so here from magnification
M = - u /v
2 = - u /v )
v = -2u = -2(30)
v =- 60 cm
so from equation 1
1/f = 1/u + 1/v
1/f = 1/30 + 1/-60
f = 60.02 cm
so R = 2f
R = 2( 60.02)
R = 120.04 cm
so radius of curvature is 1.2 m
Answer:
The circular loop experiences a constant force which is always directed towards the center of the loop and tends to compress it.
Explanation:
Since the magnetic field, B points in my direction and the current, I is moving in a clockwise direction, the current is always perpendicular to the magnetic field and will thus experience a constant force, F = BILsinФ where Ф is the angle between B and L.
Since the magnetic field is in my direction, it is perpendicular to the plane of the circular loop and thus perpendicular to L where L = length of circular loop. Thus Ф = 90° and F = BILsin90° = BIL
According to Fleming's left-hand rule, the fore finger representing the magnetic field, the middle finger represent in the current and the thumb representing the direction of force on the circular loop.
At each point on the circular loop, the force is always directed towards the center of the loop and thus tends to compress it.
<u>So, the circular loop experiences a constant force which is always directed towards the center of the loop and tends to compress it.</u>