Electricity & Magnetism MCQs with Answers

A D.C generator has _ on the end of its coil.

• A.Carbon brushes
• B.Slip rings
• C.Split rings
• D.Commutator segments

An electron is moving perpendicular to the magnetic field, which of the following is correct statement about electromagnetic force acting on the electron?

• A.Force acting is zero
• B.Force acting is maximum
• C.Force acting is minimum but not zero
• D.Force acting is independent of the angle

Magnetic field inside the solenoid along its axis is _?

• A.Weak and non-uniform
• B.Weak and uniform
• C.Strong and non-uniform
• D.Strong and uniform

When a charged particle enters a uniform magnetic field, its kinetic energy _?

• A.Increases
• B.Decreases
• C.Remains constant
• D.First increases then decreases

Liquids that conduct an electric current are called ?

• A.Conductors
• B.Electrolytes
• C.Insulators
• D.Semiconductors

One electron is moving in an electric and magnetic field. It will gain energy from ?

• A.Electric field
• B.Magnetic field
• C.Both electric and magnetic fields
• D.None of these

Capacitance of a capacitor does not depend on _?

• A.Area of the plates
• B.Distance between the plates
• C.Electric field between plates
• D.Nature of the dielectric medium

Consider three-point charges A, B, and C as shown in the figure. If the resultant force on charge A due to charge B and charge C is 0.024 N, the direction of resultant force will be _?

• A.Toward Charge B
• B.Toward Charge C
• C.Perpendicular to the line joining B and C
• D.Away from both charges

Lenz's law is consistent with the

• A.Law of conservation of energy
• B.Law of conservation of momentum
• C.Law of conservation of charge
• D.Law of conservation of mass

Which of the following is not a ferromagnetic material?

• A.Iron
• B.Cobalt
• C.Barium
• D.Nickel