Answer: Option B
Explanation : When a negatively charged object A gets in contact with the neutral object B, the negative charge of object will induce the opposite charges on object B. Hence, there will be a positive charge on object B
P=W/t
t=W/P
t=3,000,000 / 80,000
t= 37.5 second
Answers:
a)
and
, hence 
b)

Explanation:
a) At the equator, both the <u>centripetal force</u>
and the <u>gravitational force</u>
(also called true weight) are directed "downward", while the <u>normal force</u>
(also called apparent weight) is directed "upward". Therefore we have the following equation:
(1)
Where:
being
the mass and
the acceleration due gravity
being
the centripetal acceleration at the equator
According to this (1) is rewritten as:
(2)
Isolating
:
(3)
(4)
(5)
(6) This is the apparent weight at the equator
The true weight is given by 
Hence:
(7)
As we can see 
b) Now we have to calculate the apparent weight at the poles
:
(8)
Since
(8) is rewritten as:
(9)
(10)
(11)
So, the apparent weight of the person at the poles is 735 N and at the equator is 732.47 N
Makes the electron move in a certain direction which can be measured through Flemming's left hand rule.