TEST SERIES - 65 (I)

A hollow metal sphere of radius 5 cm is charged so that the potential on its surface is 10 V. The potential at the centre of sphere is

• Zero

• 10 V

• More than 10 V

• None of the above

The potential inside a hollow spherical conductor

• is constant

• varies directly as the distance from the centre

• varies inversely as the distance from the centre

• None of the above

The electric field intensity on the surface of a charged conductor is

• Zero

• Directed normally to the surface

• Directed tangentially to the surface

• Directed along 45° to the surface

Kirchhoff’s first law, i.e., SI = 0 at a junction, deals with conservation of

• Charge

• Energy

• Momentum

• Angular momentum

The resistance of material increases with temperature. It is a

• Metal

• Insulator

• Semiconductor

• None of the above

Fuse wire should have

• Low resistance, high melting point

• Low resistance, low melting point

• High resistance, low melting point

• High resistance, high melting point

Magnetic field inside a solenoid is

• Directly proportional to current

• Inversely proportional to current

• Directly proportional to its length

• Inversely proportional to the total number of turns

The energy stored in a capacitor is actually stored

• On the positive plate

• On the negative plate

• On the outer surface of the body

• Between the plates

Energy stored in the choke coil in the form of

• Heat

• Electric energy

• Magnetic energy

• None of the above

The core of a transformer is laminated to reduce

• Copper loss

• Magnetic loss

• Eddy current loss

• hysteresis loss