1999 - WAEC Physics Past Questions and Answers - page 4

Using the data on the diagram above, calculate the potential difference across the 20- Ω resistor. (Neglect the internal resistance of the cell)

Using the diagram above, calculate the effective capacitance of the circuit

The parts of a bar magnet at which the magnetic effect is strongest are called the

A resistance wire of length 2 m and of uniform cross-sectional area 5.0 x 10^-7 m² has a resistance of 2.2 Ω Calculate its resistivity

Magnetic flux density is defined as the

The voltage and current in the primary of a transformer are 200V and 2Arespectively. lf the transformer is used to light ten 12 V, 30 W bulbs, calculate its efficiency.

In a uniform electric field, the magnitude of the force on a charge of 0.2 C is 4N. Calculate the electric field intensity

A 10- Ω coil takes 21 s to melt 10g of ice at 0^oC. Assuming no heat losses, determine the current in the coil. (Specific latent heat of fusion of ice = 336 Jg^-1)

A point charge of magnitude 2μC is moved through a distance of 0.02 m against uniform field of intensity 25 Vm^-1 Calculate the work done on the charge

Bohr’s atomic model proves most successful for the explanation of the. I. structure of the hydrogen atom; II. line spectra of the hydrogen atom; III. Multi-electron atoms. Which of the statements above is/are correct?