NECO Physics Past Questions & Answers - Page 20

98.

Calculate the magnitude of the force due to a magnetic field of 0.40T on an electron moving perpendicular to the field with a speed of 4.00 × 106ms-1 (e 1.60 × 10-19C]

A.

6.40 × -10

B.

6.40× 10-13N

C.

2.56 × 10-13N

D.

1.60 × 10-12N

E.

2.30 × 10-11N

Correct answer is C

No explanation has been provided for this answer.

99.

A stone of mass 0.7 kg is projected vertically upward with a speed of 5 ms-1. Calculate the maximum height reached. [g =10ms-2]

A.

1.25m

B.

1.50m

C.

2.50m

D.

3.75m

E.

5.00Nm

Correct answer is A

No explanation has been provided for this answer.

100.

A projectile is projected with an initial velocity u, at an angle θ to the horizontal. The maximum height attained is.

A.

U2 sin \(\frac{\theta}{g}\)

B.

2U2 sin2 \(\frac{\theta}{g}\)

C.

U sin2 \(\frac{\theta}{g}\)

D.

U2 sin2\(\frac{\theta}{g}\)

Correct answer is D

No explanation has been provided for this answer.