Current Electricity-Potentiometer [HBCSE Olympiads (Homi Bhabha Centre for Science Education) NSEP (Physics)]: Questions 1 - 2 of 2

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Passage

A nichrome wire AB, long and of uniform cross section is mounted on a meter scale the points A and B coinciding with and marks respectively. The wire has a resistance . Any point C along this wire, between and is called a variable point to which on end of and electrical element is connected. In the following questions this arrangement will be referred to as ‘wire AB’ .

Question 1 (1 of 2 Based on Passage)

Potentiometer

Appeared in Year: 2016

Question

MCQ▾

The emf of a battery is determined using the following circuit with ‘wire AB’ . The galvanometer shows zero deflection when one of its terminals is connected to point C. If the internal resistance of the battery is , its emf is –

Circuit of Galvanometer

Choices

Choice (4)Response

a.

b.

c.

d.

Question 2 (2 of 2 Based on Passage)

Potentiometer

Appeared in Year: 2016

Question

MCQ▾

The ‘wire AB’ is now part of the adjacent circuit. With the resistors and , the null point is obtained at where . When the resistors are interchanged, the null point is found at with . The systematic error in this experiment seems to be due to non – coincidence of A and B with mark and mark, respectively. If these end errors are equivalent to and respectively, then they are –

Adjacent Circuit with Wire AB

Choices

Choice (4)Response

a.

0 and 1

b.

0.33 and 0.33

c.

1 and 0

d.

1 and 1