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416
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
  • A. 1.8 x 10-7Ωm
  • B. 5.5 x 10-7Ωm
  • C. 1.8 x 10-7Ωm
  • D. 5.8 x 107Ωm
View Answer & Discuss (9) WAEC 1999
417
Magnetic flux density is defined as the
  • A. total number of magnetic lines of force surrounding a magnet
  • B. number of magnetic lines of force per unit area normal to the magnetic field
  • C. strength of the magnetic field surrounding a current-carrying conductor
  • D. magnetic force exerted on a unit magnetic pole
View Answer & Discuss WAEC 1999
418
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.
  • A. 100%
  • B. 90%
  • C. 75%
  • D. 50%
View Answer & Discuss (8) WAEC 1999
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419
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. 20 N C-1
  • B. 8 N C-1
  • C. 5 N C-1
  • D. 2 N C-1
View Answer & Discuss (2) WAEC 1999
420

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

  • A. 16A
  • B. 5A
  • C. 4A
  • D. 3A
View Answer & Discuss (5) WAEC 1999
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