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Electric Resistance and Ohms Law

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Question
ICSEENIPH12029816
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When a potential difference of 3V is applied between the two ends of a 60 cm long metallic wire, current density in it is found to be 1 x 10 -7 Am 2. Find conductivity of the material of the wire in SI system.

Solution


Given,

Length of the metallic wire, L = 60 cm = 0.6 m
A = Area of the cross section of the conductor
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Question
ICSEENIPH12029842
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Chose the correct alternative A, B, C or D

In current electricity. Ohm’s law is obeyed by all:

  • solids

  • metals

  • liquids
  • gases

Solution

B.

metals

Question
ICSEENIPH12029848
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Name any one instrument which works on the principle of Tangent law in magnetism.

Solution

Tangent Galvanometer works on the principle of tangent law in magnetism.

Question
ICSEENIPH12029864
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In the circuit shown below Figure 3, E1 and E2 are batteries having emfs 4.0 and 3.5 V respectively and internal resistance 1Ω and 2Ω respectively. Using Kirchoff s laws, calculate currents : I1, I2 and I3. 

                         

Solution

(i)
In closed circuit PQSP

I1>1 - 4I1 + 10I3 = 5         ...(1)

Applying Kirchoff s First law at pt. θ.

I3 = I1 + I2

Using the above value of I3 in equation (1)

I, + 4I 1, + 10(I1 + I2 ) = 4

151, + 10I2 = 4                 ...(2)

In closed circuit RQSR

2I2 + 3I2+ 10a +I2) = 3-5

10I, + 15I2 = 3-5    -(3)

On Solving equation (2) and (3) we get

12    = 0-1 Amp., I1 = 0-2 Amp.,

13    = I, + I2 

       = 0-3 Amp 

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