JAMB Physics Past Questions & Answers - Page 456

2,276.

A cell of internal resistance 0.01Ω can be measured accurately using the

A.

Ohm meter

B.

metre bridge

C.

potentiometer

D.

electroscope

Correct answer is C

No explanation has been provided for this answer.

2,277.

An electron of charge 1.6 x 10-19C and mass 9.1 x 10-31kg is accelerated between two metal plates with a velocity of 4 x 107ms-1, the potential difference between the plates is

A.

4.55 x 103V

B.

4.55 x 102V

C.

9.10 x 101V

D.

4.55 x 101V

Correct answer is A

When a charged particle is accelerated across a region of p.d. V Volt, the work done is the product of the charge Q and the p.d. V

i.e. Work done = Q x V

But this work done is equal to the K.E. imparted to the charge given by K.E = 1/2MV2, where V is the velocity of the charge = Q x V = 1/2MV2

∴ p.d V = (1/2MV2)/Q
= 1/2 x 9.1-31 x [4 x 107]2/1.6 x 10-19
= 8 x 9.1 x 102/1.6
= 4550V
= 4.55 x 103V

2,279.

If a charged ion goes through combined electric and magnetic fields, the resultant emergent velocity of the ion is

A.

E/B

B.

EB

C.

B/E

D.

E - B

Correct answer is A

No explanation has been provided for this answer.