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 ⃗⃗⃗ = ฮผ_{0} I`
- b)`∮ B⃗ Xdl ⃗⃗⃗ = ฮผ_{0} I`
- c) `∮ B⃗ Xdl ⃗⃗⃗ = ฮผ_{0} I^{2}`
- d) None of these
- a) `∮ B⃗ .dl ⃗⃗⃗ = ฮผ_{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 Sinฮธ , 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
