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)

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)

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

Answer

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

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.

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