## Q1 Two free parallel wires carrying currents in the same direction :

• (a) attract each other
• (b) repel each other
• (c) do not effect each other
• (d) get rotated to be perpendicular to each other

• (a) attract each other

## Q2 Value of    \frac{μ_{0}}{4π}  is given by :

• (a) 10^{-7}
• (b) 10^{-5}
• (c) 10^{-4}
• (d) 10^{-6}

• 10^{-7}

## Q3  Force on a current carrying conductor placed inside a magnetic field :

• (a) F=BILsinθ
• (b) F= ma
• (c) F=B/LI
• (d) \frac{μ_{0}}{4π} BILsinθ

• a) F=BILsinθ

## Q4 Two parallel wires carrying currents in the same direction attract each other because of :

• (a) Potential difference between them
• (b) Mutual induction between them
• (c) Electric forces between them
• (d) Magnetic forces between them

• (d) Magnetic forces between them

• (a) True
• (b) False

• (a) True

• (a) True
• (b) False

• (a) True

• (a) True
• (b) False

• (b) False

## Q8 The units of magnetic moment are

• (a) Am^{-2}
• (b) A m
• (c) Am^{-1}
• (d) Am^{2}

• (d) Am^{2}

## Q9.  Moving coil galvanometer is used for the measurement of

• (a) Very small electric current
• b) Large electric current
• c). Speed
• d). Length

• (a) Very small electric current

## Q10 To convert galvanometer into ammeter which one is connected with the coil

• a) High resistance wire in series
• b) Low resistance wire in parallel
• c) High resistance wire in parallel
• d) Low resistance wire in series

• b) Low resistance wire in parallel

### ELECTRIC DIPOLE NOTES: ELECTRIC DIPOLE , DIPOLE LENGTH, ELECTRIC FIELD DUE TO ELECTRIC DIPOLE

Electric Dipole: It is a  system of equal and opposite charges separated by some  fixed distance. DIPOLE LENGTH : the distance AB = 2a is ...