Question

52. A metallic conductor at 10°C connected in the
left gap of meter bridge gives balancing length 40
cm. When the conductor is at 60°C, the balancing
point shifts by ---cm, (temperature coefficient of
resistance of the material of the wire is (1/220)/°C)
1) 4.8 2) 10 3) 15 4) 7.​

Answer 1

Answer:

R

1

−Initial R(10

0

C)

R

2

−Final R(20

0

C)

Q

R

1

=

60

40

=

3

2

Q

R

2

=

55

45

R

2

R

1

=

3×9

2×11

R

2

R

1

=

27

22

1+αΔT

1

=

27

22

⇒

27

22

=1+αΔT

⇒

22×50

5

=α⇒α=

220

1

Answer 2

Answer:

Answer is option A) 4.8

Explanation:

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