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Concepts Of Physics MCQ Edition [Volume 2]PhysicsPermanent Magnets

Of the four graphs provided, which one best represents the current-deflection relation for a tangent galvanometer?

Options

  1. Ad
  2. Bc
  3. Cb
  4. Da

Correct answer

B. c

Step-by-step solution

The relation between the current i and the angle of deflection in a tangent galvanometer is given by: i = K where K is the reduction factor of the galvanometer. Rearranging the formula for , we get: = ⁻¹ ( i K ) Analyzing the function (i) : 1. At i = 0 , = ⁻¹(0) = 0 . The graph passes through the origin. 2. For small values of i , i K , so the graph initially has a constant positive slope. 3. As i , 2 . The graph has a horizontal asymptote at = 2 . 4. The slope is d di = K K^2 + i^2 , which decreases as i increases

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