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Moving Charges and Magnetism - CBSE Class 12th NCERT Solution

Aug 7, 2013 17:53 IST

    Get, detailed solutions to the questions of the chapter Moving Charges and Magnetism from NCERT textbooks. The objective is to helping students regarding the pattern of answering the question as per the cbse latest marking scheme. Cbse.jagranjosh.com provided you NCERT solutions for classes 12th math and science subjects.
    Some questions of this chapter are given here.

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    Q. A circular coil of wire consisting of 100 turns, each of radius 8.0 cm carries a current of 0.40 A. What is the magnitude of the magnetic field B at the centre of the coil?

    Sol.

    Given:
    N = 100
    R = 8cm
    I = 0.4 A

    By the formula

    Substitution yields
    B = 3.1x10-4 T

    Q. A long straight wire carries a current of 35 A. What is the magnitudeof the field B at a point 20 cm from the wire?

    Sol.

    Given:
    I = 35 A
    x = 20 cm

    Let us consider an Amperian loop of radius equal to x, i.e. 20 cm
    Therefore by formula,

    Solving for B
    B = 3.5x10-5 T

    Q. A long straight wire in the horizontal plane carries a current of 50 Ain north to south direction. Give the magnitude and direction of B at a point 2.5 m east of the wire.

    Sol.

    Given:
    I = 50 A
    R = 2.5 m

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    Using the above formula
    B = 4x10-6 T
    Direction is vertical up.

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