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Magnetic Effects of Electric Current Test - 37

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Magnetic Effects of Electric Current Test - 37
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  • Question 1
    1 / -0
    Magnetic lines of force due to a bar magnet do not intersect because 
    Solution
    Magnetic lines of force due to a bar magnet do not intersect because a point always has a single net magnetic field.
  • Question 2
    1 / -0
    With the help of which law the direction of magnetic field due to current carrying conductor be decided?
    Solution
    The direction of magnetic field due to a current carrying conductor can be decided using the Right hand thumb rule. It states that if you point your thumb in the direction of current, then the direction of curl of your fingers gives the direction of the magnetic field.

  • Question 3
    1 / -0
    The direction of magnetic field lines in a region outside the bar magnet are ......................................
    Solution
    A. From the NN pole towards the SS pole of a magnet.
  • Question 4
    1 / -0
    What is the field line of a magnetic field passing through the centre of current carrying circular ring?
    Solution
    B. Straight line
    At the centre of current carrying circular ring, the magnetic field lines are straight.
  • Question 5
    1 / -0
    The magnetic field produced in a straight conducting wire on passing the current through it is _______.
    Solution
    The magnetic field lines around a straight current carrying conducting wires are concentric circles whose centres lie on the wire. The direction the magnetic field lines can be determined by right-hand thumb rule.
  • Question 6
    1 / -0
    According to right hand thumb rule, whose direction is indicated by a thumb?
    Solution
    A. Electric current
    Definition of right hand thumb rule: If we hold the wire in right hand in such a way that the thumb points towards the direction of current then the curled fingers on the wire gives the direction of magnetic field.

  • Question 7
    1 / -0
    Which of the following statements is false?
    Solution
    D. The magnetic field lines can cross each other.
    If the magnetic field lines cross each other, it would mean that magnetic field has two directions at that point, which is not possible. Hence, magnetic field lines can cross each other.
  • Question 8
    1 / -0
    Which of the following correctly describes the magnetic field near a long straight wire?
    Solution
    Hint: In a magnetic field, a moving charge experiences a force that is perpendicular to both its own velocity and the magnetic field.

    Correct Answer: Option D

    Explanation of Correct Answer:
    \bulletA long straight wire's magnetic field lines are made up of concentric circles centred on the wire. The right hand thumb rule determines the direction of magnetic field lines.
    So, the correct answer is option (D).

    Explanation of Incorrect Options:
    \bulletThe magnetic field will dissipate at half distance between the two wires if there is a perpendicular wire with the same current but in the opposite direction, as shown by the Right hand thumb rule, since each wire will generate a magnetic field of equal strength but in opposing directions. So, Option (A) is  incorrect.
    \bulletWhen a charged particle moves parallel to a magnetic field, it experiences no magnetic force. So, option (B) is incorrect.
    \bulletThe magnetic field lines created around a straight current-carrying wire are concentric circles, according to the right hand thumb rule. So, option (C)  is incorrect.

    Therefore, Option (A), (B) and (C) are incorrect. The correct answer is option (D).

  • Question 9
    1 / -0
    The device used for producing electric current is called a
    Solution
    Correct Answer: Option  (A)

    Explanation for Correct Option:
     A generator is a device which converts a mechanical form of energy into electrical energy. The principle of generator is based on electromagnetic induction.
    Therefore, the correct answer is option (A)

    Explanation for wrong options: 
    Galvanometer is used as voltmeter or ammeter to find voltage and current respectively. So option (B) and option (C) are incorrect.
    Motor have different applications and it does not produce electric current instead it use electric current to run. So option(D) is also wrong. 

    Therefore, option (B), (C)  and (D) are wrong. The Correct answer is Option : (A)

  • Question 10
    1 / -0
    Electromagnetic induction is
    Solution
    Hint: The creation of an electromotive force across an electrical conductor in a changing magnetic field is known as electromagnetic induction.

    Correct answer: Option D

    Explanation of correct answer:
    When a coil is moved close to a magnet and a relative motion between the two is generated by moving either the magnet or the coil, the magnetic flux connections via the coil change. An emf and, as a result, an electric current flow through the coil as a result of the change in magnetic flux.
    Therefore, the correct answer is option (D).

    Explanation of Incorrect Options:
    During the charging by induction procedure, the charged particle is held near an uncharged conductive substance grounded on a neutrally charged material. There is no relative motion between the magnet and the coiled conductor. So, Option (A) is incorrect.
    current must flow when a changing magnetic field passes through a wire coil. Due to the fact that the magnetic field remains constant. So, Option (B) is incorrect.
    The process of rotating the armature of a generator counteracts the induction cause.. So, Option (c) is incorrect.

    Therefore, option (A), option (B) and option (C) are incorrect. The correct answer is option (D).

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