What is the expression for electric potential due to an electric dipole at a point on the axis at distance r?

• A) 𝑽 = 𝒒/(4𝝅ε₀r)
• B) 𝑽 = 𝒒d/(4𝝅ε₀r)
• C) 𝑽 = 𝒒d/(4𝝅ε₀r²)
• D) 𝑽 = 𝒒/(4𝝅ε₀r²)

It is required to suspend a proton of charge q and mass m in an electric field. The strength of field must be:

• A) m/qv
• B) qv/mg
• C) mg/q
• D) q/mg

Electric field due to oppositely charged parallel plate capacitor is

• A) σ/2εo
• B) ϕ/εo
• C) σ/εo
• D) ϕ/2εo

If the area of the plates increase by 6 times, and the distance between plates is reduced to half, the capacitance will be

• A) increased by 3 times
• B) decreased by 12 times
• C) decreased by 3 times
• D) increased by 12 times

What is the direction of the force between two charges according to Coulomb's law?

• A) Towards each other
• B) Away from each other
• C) Depends on the polarity of the charges
• D) Perpendicular to each other

In US the electricity standards are:

• A) 120 Volts and 50 Hertz
• B) 120 Volts and 60 Hertz
• C) 100 Volts and 50 Hertz
• D) 230 Volts and 50 Hertz

The electric mains supply in our homes and offices is a voltage that varies like a sine function with time. Such a voltage is called ___ and the current driven by it in a circuit is called ____.

• A) DC voltage, AC current
• B) AC voltage, DC current
• C) AC voltage, DC voltage
• D) AC voltage, AC current

Greenhouse gases absorb _____ radiation.

• A) infrared
• B) microwaves
• C) gamma
• D) ultraviolet

What is the unit of electric potential?

• A) Joule/Meter
• B) Volt/Coulomb
• C) Joule/Coulomb
• D) Newton/Meter

The relation between electric filed due to infinite sheet of charge (Es) to oppositely charged parallel plate capacitor of infinite length (Ec) is

• A) Es = 2Ep
• B) Es = Ep
• C) Ec = 2Es
• D) Es = 4Ep

Work done between two points on equipotential surface is

• A) Zero
• B) Maximum
• C) Infinite
• D) Negative

What is the unit of charge distribution for linear density?

• A) Coulomb / length2
• B) length / Coulomb
• C) Length/ Farad
• D) Coulomb / length

How is the capacitance of a capacitor defined as?

• A) Voltage per unit charge
• B) Amount of charge stored per unit potential difference
• C) Electric field strength
• D) Electric force per unit charge

We desire to make an LC circuit that oscillates at 100 Hz using an inductance of 2.5H. We also need a capacitance of:

• A) 1μF
• B) 100μF
• C) 1 F
• D) 1mF

Which physical quantity is produced by a calculation where a charge is multiplied by a potential difference (p.d)?

• A) Energy
• B) e.m.f
• C) Current
• D) Power

Magnetic flux (ΦB​) is defined as:

• A) The strength of a magnet
• B) The quantity of magnetic field passing through a surface
• C) The ability of a material to conduct magnetic lines
• D) The measure of magnetic pole strength

Maximum power delivered by a battery is:

• A) VIT
• B) 4rE2
• C) Unlimited
• D) E2/4r

If 0.5 T field over an area of 2m2 which lies at an angle of 600 with field. Then the resultant flux will be

• A) 0.50 T
• B) 0.50 Wb
• C) 0.25 Wb
• D) 0.25 T

The value of k in coulomb's law depends upon

• A) magnitude of charges
• B) distance between charges
• C) medium between two charges
• D) all of these

Inductive reactance XL of an inductor is:

• A) 2πL
• B) πfL
• C) 4πfL
• D) 2πfL