Waec Physics 2016 Past Questions and Answers

Question 41:

• WAEC 2016

In storing magnets, keepers are used to

A. Reduced self-demagnetization
B. Cancel the effect of the earth's magnetic field
C. Protect the magnet from stray electric field
D. Increase the strangth of the magnets

Question 42:

• WAEC 2016

A 10\(\mu\)C charge moves with a velocity of 1.0 x 10⁵ ms^-1 at right angle to a uniform magnetic field of flux density 5.0 x 10^-4T. Calculate the force on the charge

A. 5.0 x 10^-5N
B. 5.0 x 10^-4N
C. 5.0 x 10⁵N
D. 5.0 x 10⁶N

Question 43:

• WAEC 2016

Which of the following statements is not correct about steel and soft iron?

A. Steel is more magnetized than soft iron
B. Permanent magnets are usually made of steel
C. Soft iron is more readily magnetized than steel
D. Soft iron more readily loses its magnetism than steel

Question 44:

• WAEC 2016

What determines the polarity at the ends of an electromagnet? The

A. Magnitude of the current passing through the wire
B. Material of the core of the magnet
C. Material of the coil
D. Direction of current in the wire

Question 45:

• WAEC 2016

How many beta particle(s) are emitted in the radioactive decay of \(^{198}_{79}Au \leftarrow ^{198}_{80}Hg\)?

A. 1
B. 2
C. 3
D. 5