Dielectric Materials | MCQs

Explanation

The dielectric constant of water at around 18°C is approximately 80.

This high value makes water an excellent polar solvent for ionic and polar compounds.

Explanation

The electric field due to a positive charge points away from the charge, i.e., radially outward.

Field lines show the direction a positive test charge would move.

Explanation

Mica is a dielectric material that increases the capacitance when placed between capacitor plates.

It does so by reducing the electric field and allowing the capacitor to store more charge for a given voltage.

Explanation

• Charge: Q=1mC=1×10^−3C

• Voltage: $V = 100,text{V}$

• The formula for capacitance is:

C=Q/V​

Calculation:

$$C = frac{1 times 10^{-3}}{100} = 1 times 10^{-5},text{F} = 10,mutext{F}$$