What amount of current would pass through a 10 Ω co...
What amount of current would pass through a 10 Ω coil if it takes 21s for the coil to just melt a lump of ice of mass 10g at 0oC if there are no heat losses? (Latent heat of fusion of ice = 336 Jg\(^{-1}\)).
16.00A
4.00A
0.50A
0.25A
0.06A
Correct answer is B
I\(^2\)Rt = mI;
I = \(\sqrt{\frac{mI}{Rt}}\)
= \(\sqrt{\frac{10 \times 336}{10 \times 21}}\)
= \(\sqrt{16}\)
= 4.0A
The force exerted on a charged body in an electric field depends on I. the charge on the body ...
Which of the following have the greatest penetrating power? ...
A short bar magnet is placed in earth's magnetic field, as shown above, which of the points II a...
A platinum-resistance thermometer has a resistance of 10 ω at 0°C and 18 ω at 100°C. Assuming th...
A concave mirror can be used to produce a parallel beam of light if a lighted bulb is placed ...
When a girl moves towards a plane mirror at a speed of 4.0m/s, the distance between the girl & h...