In the circuit diagram above, E is a battery of negligibl...
In the circuit diagram above, E is a battery of negligible internal resistance. If its emf is 9.0V. Calculate the current in the circuit
1.8A
1.0A
0.8A
0.3A
Correct answer is B
1r=1r1+1r2
= 15+120
= 4+120=520
r = 205
= 4Ω
R = R1 + R2
= 5 + 4
= 9Ω
but V = IR
I = VR=99
= 1A
When white light is dispersed by a spectrometer, the component having the shortest wavelength is ...
Given that SQ = 10cm and SP = 6cm, the refractive index of a block of glass shown above is ...
The colours seen in the thin films of oil on the road and in soap bubbles are due to ...