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

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

Consider the following statements, and then select the correct ones. I. Most of the electrical devices we use require AC voltage. II. Most of the electrical energy sold by power companies is transmitted and distributed as alternating current. III. AC voltage can be easily and efficiently converted from one place to another by means of transformers.

• A) I, II, and III are correct.
• B) I and II are correct, and III is incorrect.
• C) I is correct, and II and III are incorrect.
• D) I and III are correct; II is incorrect.

In the context of magnetic force, if the velocity vector v is perpendicular to the magnetic field vector B, the resulting force vector F will be:

• A) Minimum
• B) Zero
• C) Can not be determined
• D) Maximum

Work done between two points on equipotential surface is

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

The current in a car headlamp is 2.0 A. The headlamp is switched on for 3.0 minutes. How much charge passes through the headlamp?

• A) 2.0 C
• B) 90 C
• C) 360 C
• D) 4.0 C

If the velocity of a charged particle in perpendicular electric and magnetic field is 7.27 x 106 m/s and the Electric field is 6 x 106 N/c, what should be the value of the magnetic field?

• A) 0.45 T
• B) 0.83 T
• C) 0.78 T
• D) 0.94 T

In what paths do eddy currents typically circulate within a conductor?

• A) random patterns
• B) Elliptical or circular paths
• C) Spiral paths
• D) Straight lines

The transformer voltage induced in the secondary coil of a transformer is mainly due to:

• A) A varying electric field
• B) A varying magnetic field
• C) The vibrations of the primary coil
• D) The iron core of the transformer

Why is the work done by the magnetic force always zero on a charged particle?

• A) The force and velocity vectors are parallel.
• B) The velocity of the particle is small.
• C) The force and velocity vectors are perpendicular.
• D) The magnetic force is weak.

If a charged particle moves in a magnetic field, what effect does the magnetic force have on the kinetic energy of the particle?

• A) It increases the kinetic energy.
• B) It stops the particle.
• C) It decreases the kinetic energy.
• D) It does not change the kinetic energy.

The wave form of alternating voltage is a:

• A) Sine wave
• B) Tangent wave
• C) Contingent wave
• D) Cosine wave

The potential difference between the ends of a conductor is 12 V. How much electrical energy is converted to other forms of energy in the conductor when 100 C of charge flows through it?

• A) 1200 J
• B) 88 J
• C) 0.12 J
• D) 8.3 J

Capacitance of a capacitor in vacuum is given by:

• A) A/ εo d
• B) Ad/ εo
• C) A εo /d
• D) A/ εr d

If the voltage in a circuit is 10 volts and the resistance is 5 ohms, what is the power consumed?

• A) 2 watts
• B) 20 watts
• C) 10 watts
• D) 50 watts

Radio waves and light waves are __________.

• A) Longitudinal waves
• B) Transverse waves
• C) Electromagnetic and longitudinal both
• D) Electromagnetic and transverse both

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

If the electric and magnetic forces on a charged particle are not balanced in a velocity selector, what will happen to the particle?

• A) It will be deflected.
• B) It will stop moving.
• C) It will move in a straight line.
• D) It will be accelerated.

How is charge density defined for linear charge distribution?

• A) dq = dA
• B) dq = σds
• C) dq = pdV
• D) dq = λds

Phase difference between V and I of an A.C through resistor is:

• A) 270 degree
• B) 0 degree
• C) 180 degree
• D) 90 degree

How could the unit of potential difference, the volt, also be written?

• A) A/s
• B) C/A
• C) J/C
• D) C/J