Question

a) Give an example in nature which shows that sunlight is
made up of different colours .
(b) Name the phenomenon due to which we get light from the
sun before sunrise.
(c) Two resisters of 3.2 each and an unknown resistors are
connected in a series across a 12V battery, if the voltage drop
across the unknown resister is 6 V, find
1. Potential across each 30 resistance.
ii. The current through unknown resistor 'R'​

Answer 1

a) rainbow

b) by moon

c) Solution:

R1=3 ohms

Second resistance=R2 ohms

As they are connected in series :

Eff R= R1+R2

=3+R2 ohms

V=12V

V2=6V

AS IT IS SERIES CONNECTION:

V=V1+V2

12= V1+6

V1= 6VOLTS

POTENTIAL DROP ACROSS FIRST RESISTANCE IS 6V

By ohms law:

V1=IR1

6=Ix3

I=6/2=3A

In series connection:

I=I1=I2

So current ACROSS unknown resistance is also 2A

V2=IR2

6=2xR2

R2=6/2=3ohms

Unknown resistance =3ohms

Effective resistance in Series = 3+3=6ohms

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