Electricity & Magnetism MCQs with Answers

If the material has resistivity (Ω-cm) in the range of 10⁵ to 10⁹, then the material is termed as a/an?

• A.Conductor
• B.Semiconductor
• C.Insulator
• D.Superconductor

Heating effect caused by an electric circuit is written as ?

• A.H = I^2Rt
• B.H = IR^2t
• C.H = VIt^2
• D.H = I^2R/t

A bar magnet of magnetic moment 200 A−m² is suspended in a magnetic field of intensity 0.25 N/A−m. The couple required to deflect it through 30° is _?

• A.25 N−m
• B.50 N−m
• C.100 N−m
• D.12.5 N−m

Conductance of electricity through aqueous solution of sodium chloride is dependent upon flow of _?

• A.Electrons
• B.Atoms
• C.Ions
• D.Molecules

SCR is a layer device.

• A.Two
• B.Three
• C.Four
• D.Five

A moving charge will gain energy due to the application of _?

• A.Magnetic field
• B.Electric field
• C.Gravitational field
• D.Nuclear field

The direction of induced current is determined by?

• A.Faraday's law
• B.Fleming's right-hand rule
• C.Ohm's law
• D.Lenz's law

For measuring resistance quickly, the most useful device is the?

• A.Voltmeter
• B.Ammeter
• C.Ohmmeter
• D.Galvanometer

Wheatstone bridge is used to determine the _?

• A.Capacitance
• B.Current
• C.Voltage
• D.Resistance

Current flowing in a conductor will set up a magnetic field around the conductor. The strength of the magnetic field is determined by?

• A.The temperature of the surroundings
• B.The length of the conductor
• C.The color of the conductor
• D.How much current is flowing