Choose the one alternative that best completes the statement or answers the ques

Question

Choose the one alternative that best completes the statement or answers the question. For numerical answers, choose the closest answer. Your answer must be clearly written in the corresponding box. 1) In metals, which charged particles are free to move throughout the object? A. Protons B. Neutrons C. Electrons D. Both A and C E. All of these. 2) A prism of length L is composed of material with a conductivity of sigma. Its cross section is a triangle with base 2s and height s. What is the resistance of the object across its length? A. sigma L/s^2 B. s^2/sigma L C. sigma s^2/L D. L/sigma s^2 3) When a dielectric is placed between the plates of a capacitor, the capacitor can store more energy because _____. A. the total electric field increases B. the potential increases C. atoms within the dielectric can be polarized D. All of these 4) A negatively-charged particle enters a region of magnetic field and travels in a clockwise curved trajectory. What is the direction of the magnetic field in this region? A. Into the page B. Out of the page C. To the left D. To the right E. None of these 5) A segment of current-carrying wire of length L is placed within a magnetic field B. The wire is oriented such that a current I flows theta = 45 degree clockwise from the direction of the magnetic field. What is the magnetic force that acts on this segment of wire? A. Zero B. LIB/Squareroot 2 out of the page C. LIB/Squareroot 2 to the right D. LIB out of the page E. LIB to the right

Explanation / Answer

1. Electrons are responsible for conduction,therefore they are free to move.

2. R=(length×resistivity)/area

And resistivity is 1/conductivity

So, R=length/(area×conductivity)

D IS CORRECT.

3. Actually Electric field decreases,potential decreases.

And C IS CORRECT as dielectric gets polarized and stores charge.

4. Lorentz Force :

F=q(V x B)

So, A is corect.

For a negative charge, take velocity opposite to what you see,as it will be velocity of positive charge.

5. F= BIL Sin(angle)

So, BIL/2.

OUT OF THE PAGE.

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