# KVPY (Kishore Vaigyanik Protsahan Yojana) Stream-SA (Class 11) Physics: Questions 1 of 253

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Appeared in Year: 2010

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### Question

Figure A below shows a wheat stone bridge in which P, Q, R, S are fixed resistances, G is a galvanometer and B is a battery. For this particular case the galvanometer shows zero deflection. Now, only the positions of B and G are interchanged, as shown in figure (b). The new deflection of the galvanometer Wheat Stone Bridge (Figure A) Figure A shows a wheat stone bridge in which P, Q, R, S are fixed resistances, G is a galvanometer and B is a battery. Wheat Stone Bridge (Figure B) Figure shows the positions of B and G are interchanged.

### Choices

Choice (4) Response

a.

is to the left

b.

is to the righ

c.

is zero

d.

depends on the values of P, Q, R, S

c.

## Explanation

For figure (a) galvanometer shows zero deflection. It is only possible when,

Now, after interchanging position of B and G, figure (b) can be redraw as, Showing Figure in Wheat Stone Bridge Now, after interchanging position of B and G, figure (b) can be redraw as,

Above figure is also satisfy the condition of null point as result (1),

So, deflection of galvanometer is zero.

## Analysis

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