Question

The diameter of a circle is 42 cm, find its perimeter. if the perimeter of the circle is doubled, what will be the radius
of the new circle. (Take pie =22/7)​

Answer 1

Answer:

Diameter of a circle = 42 cm

∴ Radius of circle = \frac{42}{2}=21\ cm

2

42

=21 cm

Perimeter of the circle = 2\pi r2πr

=2\times\frac{22}{7}\times21=132\ cm=2×

7

22

×21=132 cm

If the perimeter of the circle doubled

=2\times132=264\ cm2×132=264 cm

Radius = \frac{C}{2\pi}=\frac{264}{2\times\frac{22}{7}}

2π

C

=

2×

7

22

264

=\frac{264\times7}{2\times22}=42\ cm=

2×22

264×7

=42 cm

Answer 2

Step-by-step explanation:

Parallel Plate Capacitor Formula

The direction of the electric field is defined as the direction in which the positive test charge would flow. Capacitance is the limitation of the body to store the electric charge. Every capacitor has its capacitance. The typical parallel-plate capacitor consists of two metallic plates of area A, separated by the distance d.

The parallel plate capacitor formula is given by:

C=kϵ0Ad

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