Electricity & Magnetism MCQs with Answers

10C of charges are placed on a spherical conducting shell. A particle with a charge of –3C is placed at the center of the cavity. The net charge on the inner surface of the shell is:

• A.–3C
• B.+7C
• C.0C
• D.+3C

The work done in moving a charge in a closed loop in a magnetic field is ?

• A.Zero
• B.Maximum
• C.Infinite
• D.Depends on the charge

The unit of electric field intensity is _?

• A.Newton/coulomb
• B.Coulomb/newton
• C.Volt/metre
• D.Both A and C

If the direction of magnetic field is reversed, the direction of force is _?

• A.Reversed
• B.Doubled
• C.Unaffected
• D.Halved

The electric field can be detected by ?

• A.Electron
• B.Proton
• C.Neutron
• D.Photon

There are several methods to magnetize magnetic materials, such as the single-touch or double-touch method. The key feature of the double-touch method is which one of the following?

• A.A single pole of a magnet rubs in one direction
• B.Opposite poles of two magnets rub in opposite directions
• C.Same poles of two magnets rub in the same direction
• D.A magnet is heated and then cooled rapidly

Hall's effect is used to measure the?

• A.Carrier concentration
• B.Magnetic field strength
• C.Electric current
• D.Temperature coefficient

A moving charged particle is surrounded by:

• A.Only electric field
• B.Only magnetic field
• C.Both electric and magnetic fields
• D.Neither electric nor magnetic field

A resistor of 4kΩ with tolerance 10% is connected in parallel with a resistor of 6 kΩ with tolerance 10%. The tolerance of the parallel combination is nearly ?

• A.10%
• B.5%
• C.20%
• D.15%

The negative gradient of electric potential is also called?

• A.Electric resistance
• B.Electric potential energy
• C.Electric flux
• D.Electric field intensity