## 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

## 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

• (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}

• (a) True
• (b) False

• (b) True