Current Electricity

Physics
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The Kirchhoff's first law (i=0) and second law (iR=E) , where the symbols have their usual meanings, are respectively based on :

A
Conservation of charge, conservation of momentum
B
Conservation of energy, conservation of charge
C
Conservation of momentum, conservation of charge
D
Conservation of charge, conservation of energy
Medium
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In a potentiometer of ten wires, the balance point is obtained on the sixth wire. To shift the balance point to eighth wire, we should

A
increase resistance in the primary circuit.
B
decrease resistance in the primary circuit.
C
decrease resistance in series with the cell whose e.m.f. has to be measured.
D
increase resistance in series with the cell whose e.m.f. has to be measure.
Medium
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Assertion : The equivalent resistance between the points X and Y in the figure is 10.
Reason : According to Wheatstone bridge, points A and C have the same potential.

A
Both (A) and (R) are true and (R) is the correct explanation of A
B
Both (A) and (R) are true but (R) is not the correct explanation of A
C
(A) is true but (R) is false
D
(A) is false but (R) is true
Medium
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