## JOBS OF TODAY

### MCQ ON FRICTIONAL ELECTRICTY: QUIZ ON FRICTIONAL ELECTRICTY

PART 2

Q1 Electric field at the center of charged circular loop is

• ∞
• Always  0
• None of these

Q2 Direction of electric field on the axis of a charged ring is along

• ⊥ to the axis
• along the axis
• 45^{0} with axis
•  the centre

•

Q3 .The net force acting on a dipole in a uniform electric field is

• In the direction of electric field
• Opposite to the direction of electric field
• Always zero
• In a direction ⊥ to electric field

Q4 The potential energy of a dipole is  zero if angle made by the dipole moment with electric field is

• 45^{0}
• 90^{0}
• 180^{0}
• 0^{0}

•

Q5 The dipole is said to be in stable equilibrium when the dipole moment is

• In the direction of the field
• Opposite to the direction of the field
• ⊥ to the direction of the field
• At 45^{0} with the direction of the field

Q6 The dipole is said to be in unstable equilibrium when the dipole moment is

• In the direction of the field
• Opposite to the direction of the field
• ⊥ to the direction of the field
• At45^{0} with the direction of the field

Q7 If a dipole is placed in a non uniform electric field then it will experience ?

• Torque as well as force
• Only torque but no force
• Only force but no torque
• Zero force and zero torque

Q8 Torque has the units of

• Nm
• Cm
•  Nm^{2}
• Cm^{-1}

Q9 A system of two equal and opposite charges separated by a certain distance is called

• Electric field
• Electric dipole
• Electric dipole moment
• Electric flux

Q10 Dipole length is a ...

• Scalar quantity
• Vector quantity

PART 4

Q1 Force acting on a stationary point charge q in an electric field E is

• q^{2}E
• \frac{q}{E}
• qE
• \frac{E}{q}

Q2 Electric field intensity due to a source charge at a distance r varies as

• r
• r^{2}
• r^{-2}
• r^{-1}

•

Q3 Dimensional formula of electric field is

• MLT^{-3}A^{-1}
• MLT^{-2}A^{-1}
• ML^{2}T^{-2}A^{-1}
• MLT^{2}A^{-1}

Q4 The electric field E at a point just outside a perfect conductor is

• parallel to surface
• zero
• perpendicular to surface
• any direction

Q5 The electric field inside a spherical shell of uniform surface charge density

• Zero
• constant less than zero
• directly proportional to distance from center
• None of these

Q6 which of the following is deflected by a electric field

• neutrons
• alpha particles
• gamma rays
• all of these

Q7 An electron and a proton are in a uniform electric field. The ratio of their accelerations will be

• Zero
• unity
• \frac{m_p}{m_e}
• \frac{m_e}{m_p}

•

Q8 an electron enters in the electric field with its velocity in direction of electric field then

• path of electrons will be circle
• path of electrons will be parabola
• velocity of electrons will decrease
• velocity of electrons will increase

Q9 an electron having charge e and mass m moving in a uniform electric field E. Its acceleration will be

• \frac{e^2}{m}
• \frac{E^2}{m}e
• \frac{eE}{m}
• \frac{mE}{e}

ELECTRIC FLUX

Q1 Units of Electric flux are

• NC^{-1}m^{2}
• NC^{-2}m^{-1}
• N^{-1}C^{-1}m^{2}
• NC^{2}m^{2}

Q2 Electric Flux through a closed surface according to Gauss’ law is

• \frac{ε_{0}}{q}
• \frac{q}{ε_{0}}
• q{ε_{0}}
• None of these

• 
•

Q3 Electric Flux is minimum when the angle between the electric field lines and the area vector of the surface is

• 0^{0}
• 90^{0}
• 60^{0}
• 45^{0}

•

Q4 The electric field due to infinite plane sheet of charge density σ is:

• 0
• σ
• \frac{σ}{ε_{0}}
• \frac{σ}{2ε_{0}}

Q5 The electric flux due to a line charge falls off with distance as

• \frac{1}{r}
• \frac{1}{r^{2}}
• r
• None of these

Q6 Units of Electric flux are

• NC^{-1}m^{2}
• NC^{-2}m^{-1}
• N^{-1}C^{-1}m^{2}
• NC^{2}m^{2}`

Q7  Electric field inside charged spherical shell is zero

• True
• False

•

Q8 Area Vector is a

• Scalar quantity
• Vector quantity

Q9 Electric flux is a scalar quantity

• True
• False

Q10 The area vector of a surface lying in the x-y plane on the coordinate axes, points along the z direction

• True
• False