Answer:
q = Q/2
option c is correct
Explanation:
given data
charge = Q
distance r = 1 m
charge = q
to find out
what should q be
solution
we have given charge q is remove so
q1 = Q-q
q2 = q
we know by coulombs law force
force = kq1q2 / r² .............1
put here value and we know k is constant
F = k (Q-q) q / 1
now take derivative charge q and put = 0
dF/dq = k d(Q-q)q / dq
so k (Q-q)q =0
Q = 2q
q = Q/2
so option c is correct
Explanation:
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Answer:
P=F/A where F is the weight of the water and A is the area on which it is resting. The weight of the water is mg. The mass of the water is dv where d is the density and v is the volume. Finally, the volume of the water in a vessel is equal to the area of the base of the vessel times the height of the vessel. (v=Ah)
Plugging everything in we get:
P = dAhg/A
So
P=dhg
So we have shown that liquid pressure is directly proportional to height of liquid in a vessel.
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The type of current produced by a battery is direct current. C.