ECAT Physics 2

The minimum charge on any object cannot be less than:

• 1.6×10^-19C

• 3.2×10^-19C

• No definite charge

• 9.1×10^-31C

• 900 N

A wire having very high value of conductance is said to be:

• very good conductor

• moderately good conductor

• an insulator

• Semiconductor

Two capacitors C1=2uF & C2=4uF, are connected in series across a 100V supply. Find the equivalent capacitance:

• 1/2uF

• 3/2uF

• 4/3uF

• None

What is true about the electric field and electric force?

• electric field lines are towards negative and electron flow in the same direction

• electric lines are towards positive and electron flow in opposite direction

• electric field lines are towards the negative and electrons flow in opposite direction

• electric field lines are positive and electrons flow in the same direction

The capacitance of a parallel-plate capacitor is doubled if:

• The distance between the plates is doubled

• The area of the plates is doubled

• The distance between the plates is 4 times

• Both the distance and area are doubled

If a dielectric material is placed between parallel plate capacitor, the net capacitance of the capacitor:

• decreases

• increases

• constant

• zero

The unit of εr is:

• N/mA

• No unit

Two point charges +4uC and -1uC are separated by a distance d the ratio of force acting on them will be:

• 1:4

• 1:2

• 1:1

• 2:1

Gauss’s Law states that the electric flux through a closed surface depends on:

• The charge enclosed within the surface

• The shape of the surface

• The distance from the charge to the surface

• The distribution of charges outside the surface