Wednesday, 21 September 2022

Magnetic effect of current: MCQ ON AMPERE's CIRCUITAL LAW

 

Q1 The number of turns of a circular coil are doubled. Then magnetic field due to coil will get

  • a) Doubled 
  • b) Halved 
  • c) 4 times 
  • d) Remains same

  • a) Doubled 
  • Reason : magnetic field due to coil is directly proportional to number of turns. 

Q2 Magnetic field at the center of the coil

  • (a) Zero 
  • (b) Maximum
  • (c) can't be determined 
  • (d) None of these

  • (a) Zero 

Q3  Direction of magnetic field due to a current carrying circular coil can be determined by which rule?

  • (a) Right hand thumb  rule
  • (b) Right hand Rule
  • (c) Left  hand rule
  • (d) All of these 

  • (a) Right hand thumb  rule

Q4 S.I. unit of Magnetic Flux is 

  • (a) Tesla 
  • (b) Ampere 
  • (c) Henry 
  • (d) Weber

  • (d) Weber

Q5 Force on a charged particle which is at rest in strong magnetic field will be 

  • (a) Maximum
  • (b) Zero
  • (c) Insufficient data  
  • (d) None

  • b) Zero


Q6 Ampere Circuital law is

  • a) `∮ B⃗ .dl ⃗⃗⃗ = μ_{0} I`
  • b)`∮ B⃗ Xdl ⃗⃗⃗ = μ_{0} I`
  • c) `∮ B⃗ Xdl ⃗⃗⃗ = μ_{0} I^{2}`
  • d) None of these 

  • a) `∮ B⃗ .dl ⃗⃗⃗ = μ_{0} I`

Q7 Two wires carry current in different directions. They will

  • (a) Attract each other 
  • (b) Repel each other 
  • (c) Create gravitational field
  • (d) Any of the above


  • (b) Repel each other 

Q8 If  a stationary charge enters the magnetic field it experiences force at

  • (a) `90^{0}`
  • (b) `45^{0}`
  • (c) No force F=0 
  • (d) None of these

  • (c) No force F=0 ;  F = qvB Sinθ , v=0 Stationary charge therefore F =0

Q9. What is S.I.unit of Permeability?

  • a) `Wb m^{-1}A^{-1}`
  • b)  `Wb m^{-2}A^{-1}`
  • c)  `Wb m^{-1}A^{-2}`
  • d)  `Wb m^{-2}A^{-3}`

  • a) `Wb m^{-1}A^{-1}`

Q10 Magnetic poles always exist in pairs

  • (a) True
  • (b) False 

  • (b) True

 

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