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Ampere's Law - MCQ-Basic

Dear Readers,

Physics is an important subject in preparation for various Competitive exams. To keep a track of your preparation we have designed a small quiz of 10 Basic Level Questions on Ampere's Law. You have 10 minutes to solve the quiz, click the start timer button in order to start the timer and then click on submit button at the end to submit the quiz and view your scores and correct answers.

Q1. A long solenoid carrying a current produces a magnetic field B along its axis. If the current is doubled and the number of turns per cm is halved, the new value of the magnetic field is

  •  B
  •  2B
  •  4B
  •  B/2

B

Q2. A long solenoid has 200 turns per cm and carries a current of 2.5 amp. The magnetic field at its centre is [u0 = 4π x 10-7 weber / m2]

  •  3.14 x 10-2 weber / m2
  •  6.28 x 10-2 weber / m2
  •  9.42 x 10-2 weber / m2
  •  12.56 x 10-2 weber / m2

6.28 x 10-2 weber / m2

Q3. A long solenoid of length L has a mean diameter D. it has n layers of windings of N turns each. If it carries a current I, the magnetic field at its centre will be

  •  Proportional to D
  •  Inversely proportional to D
  •  Independent of D
  •  Proportional to L

Independent of D

Q4. If a long hollow copper pipe carries a current, the produced magnetic field will be

  •  Inside the pipe only
  •  Outside the pipe only
  •  Both inside and outside the pipe only
  •  Neither inside nor outside the pipe only

Outside the pipe only

Q5. In a current carrying long solenoid, the field produced does not depend upon

  •  Number of turns per unit length
  •  Current flowing
  •  Radius of the solenoid
  •  All of the above

Radius of the solenoid

Q6. A long solenoid has 800 turns per metre length of solenoid. A current of 1.6 A flows through it. The magnetic induction at the end of the solenoid on its axis is

  •  16 X 10-4 Tesla
  •  8 X 10-4 Tesla
  •  32 X 10-4 Tesla
  •  4 X 10-4 Tesla

8 X 10-4 Tesla

Q7. Mean radius of a toroid is 10 cm and number of turns are 500. If current flowing through it is 0.1 A then value of magnetic induction (in Tesla) for toroid

  •  10-2
  •  10-5
  •  10-3
  •  10-4

10-4

Q8. A current of 1/4π A is flowing through a toroid. It has 1000 number of turn per meter then value of magnetic field (in wb/m2) along its axis is

  •  10-2
  •  10-3
  •  10-4
  •  10-7

10-4

Q9. A long copper tube of inner radius R carries a current i, the magnetic field B inside the tube is

  •  u0i/2πR
  •  u0i/4πR
  •  u0i/2R
  •  Zero

Zero

Q10. A solenoid 1.5 meter and 4.0 cm in diameter possesses 10 turns/ cm. A current of 5.0 A is flowing through it. Calculate the magnetic induction (i) Inside and (ii) At one end on the axis of solenoid respectively

  •  2π X 10-3T , π X 10-3T
  •  π X 10-3T , 2π X 10-3T
  •  2π X 10-3T , 2π X 10-3T
  •  π X 10-3T , π X 10-3T

2π X 10-3T , π X 10-3T



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