PYQ Vault
EbooksTutor

Field of a long straight wire at a distance (B proportional to 1/r)

This type of question, asked 5 times: 15 May 2023 S1, 9 May 2024 S2, 17 Apr 2026 S1, 17 Apr 2026 S2, 18 Apr 2026 S2. All 5 questions below, oldest first.

Try each one first, then open its answer.

  1. Question 1

    15 May 2023 S1

    35
    The strength of magnetic field at a perpendicular distance xx near a long straight conductor carrying current II is BB. The magnetic field at a distance x3\frac{x}{3} from straight conductor will be

    Tap an option to check your answer.

  2. Question 2

    9 May 2024 S2

    48
    The magnetic field at a point P situated at perpendicular distance RR from a long straight wire carrying a current of 12 A is 3×10−53 \times 10^{-5} Wb/m2^2. The value of RR in mm is [μ0=4π×10−7\mu_0 = 4\pi \times 10^{-7} Wb/Am]

    Tap an option to check your answer.

  3. Question 3

    17 Apr 2026 S1

    132
    The magnetic field at perpendicular distance 'rr' from a long wire carrying current 'II' is 'BB'. The magnetic field at perpendicular distance '2r2r' from the same wire is

    Tap an option to check your answer.

  4. Question 4

    17 Apr 2026 S2

    132
    The magnetic field at a distance 'r' from a long straight wire carrying current I is 0.4 tesla. The magnetic field at a distance 2r will be

    Tap an option to check your answer.

  5. Question 5

    18 Apr 2026 S2

    132
    A straight long wire is carrying current I. The ratio of magnetic field due to this wire at perpendicular distance 2 cm and 5 cm respectively from the wire is

    Tap an option to check your answer.