20,000J
10,000J
5,000J
4,000J
200J
Correct answer is A
E=I\(^2\)rt
E=5\(^2\) * 8 * 100
E=20000j
Heat Energy Generated(Q) ⇔ Energy(E)
Q = 20000j
The electric potential at point P in the diagram above can be expressed as
Q2/(4πεor2)
Q/(4πεor2)
Q/(4πεor)
Q2/(4πεor2)
Q/(4πεor) 2
Correct answer is C
No explanation has been provided for this answer.
Q2/(4πεor2)
Q/(4πεor2)
Q/(4πεor)
Q2/(4πεor2)
Q/(4πεor) 2
Correct answer is B
No explanation has been provided for this answer.
Soft iron is used in making the armature of an electric bell because it
retains its magnetism for a longtime
Loses its magnetism readily
Produces permanent magnets
is not easily magnetised
decreases the magnetic effect of a direct current
Correct answer is B
No explanation has been provided for this answer.
1.85Ω
2.0Ω
2.4Ω
4.5Ω
5.0Ω
Correct answer is B
No explanation has been provided for this answer.
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