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MHT-CET Magnetic Fields due to Electric Current — practice questions — page 2

Explore 43 free Magnetic Fields due to Electric Current questions in MHT-CET Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Magnetic Fields due to Electric Current questions and exercises with answers

Showing questions 31–43 of 43.

A single circular loop of radius 5 cm carries 2 A. What is the field at its centre?Read the answer and worked solution →A coil of 10 turns, radius 4 cm and current 2 A has what central field?Read the answer and worked solution →Doubling the radius of a loop at fixed current changes its central field to:Read the answer and worked solution →On the axis of a circular loop, the net field points:Read the answer and worked solution →Far from a small current loop on its axis, the field falls with distance x roughly as:Read the answer and worked solution →The right hand rule for a straight current-carrying wire: the thumb shows the:Read the answer and worked solution →Field lines around a long straight current-carrying wire are:Read the answer and worked solution →Who discovered in 1820 that an electric current produces a magnetic field?Read the answer and worked solution →Who coined the term solenoid in 1823?Read the answer and worked solution →A solenoid is a helical coil whose length is:Read the answer and worked solution →The field inside an infinitely long solenoid does not depend on its:Read the answer and worked solution →A solenoid with a core of relative permeability mu_r has its field multiplied by:Read the answer and worked solution →The net field of a current-carrying wire at a point is found from the Biot-Savart law using:Read the answer and worked solution →

Worked practice questions

A single circular loop of radius 5 cm carries 2 A. What is the field at its centre?

  1. 1.26 x 10^-5 T
  2. 5 x 10^-5 T
  3. 2.5 x 10^-6 T
  4. 2.5 x 10^-5 T
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Correct answer: D. 2.5 x 10^-5 T

B = mu0 I/(2R) = 4 pi x 10^-7 x 2/0.1 = 2.5 x 10^-5 T.

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A coil of 10 turns, radius 4 cm and current 2 A has what central field?

  1. 3.1 x 10^-4 T
  2. 6.3 x 10^-5 T
  3. 1.6 x 10^-4 T
  4. 3.1 x 10^-5 T
Show answer and solution

Correct answer: A. 3.1 x 10^-4 T

B = mu0 N I/(2R) = 4 pi x 10^-7 x 10 x 2/0.08 = 3.14 x 10^-4 T.

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Doubling the radius of a loop at fixed current changes its central field to:

  1. double
  2. half
  3. four times
  4. one fourth
Show answer and solution

Correct answer: B. half

B = mu0 I/(2R) is inversely proportional to R, so doubling R halves B.

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