Question: The electric field at a point situated at a distance d from straight charged conductor is____________?

• 1. proportional to d
• 2. inversely proportional to d
• 3. inversely proportional to d
• 4. none of the above

Question: A field line and an equipotential surface are____________?

• 1. always parallel
• 2. always at 90°
• 3. inclined at any angle 0
• 4. none of the above

Question: The force between two charges is 120 N. If the distance between the charges is doubled, the force will be________________?

• 1. 60 N
• 2. 30 N
• 3. 40 N
• 4. 15 N

Question: The ability of charged bodies to exert force on 6ne another is attributed to the existence of____________?

• 1. electrons
• 2. protons
• 3. neutrons
• 4. electric field

Question: For making a capacitor, it is better to select a dielectric having___________?

• 1. low permittivity
• 2. high permittivity
• 3. permittivity same as that of air
• 4. permittivity slightly more than that of air

Question: Those magnetic materials are best suited for making armature and transformer cores which have ________ permeability and ________ hystersis loss.

• 1. high, high
• 2. low, high
• 3. high, low
• 4. low, low

Question: A material for good magnetic memory should have____________?

• 1. low hysteresis loss
• 2. high permeability
• 3. low retentivity
• 4. high retentivity

Question: If the area of hysteresis loop of a material is large, the hysteresis loss in this material will be____________?

• 1. zero
• 2. small
• 3. large
• 4. none of the above

Question: The initial rate of rise of current through a coil of inductance 10 H when suddenly connected to a D.C. supply of 200 V is__________Vs.

• 1. 50
• 2. 20
• 3. 0.05
• 4. 500

Question: The rate of rise of current through an inductive coil is maximum_____________?

• 1. at 63.2% of its maximum steady value
• 2. at the start of the current flow
• 3. after one time constant
• 4. near the final maximum value of current