Physics multiple choice questions 5 and 6 Chaise A has a mass of 1 kg and a char

Question

Physics multiple choice questions 5 and 6

Chaise A has a mass of 1 kg and a charge of 1 C. Charge B baa a mass of 2 kg and a charge of 2 C. 3cth are placed in the same constant electric field, and both arc irutially at rest. After they have accelerated through the same distance, which one has the higher speed? Their final speeds are the same It is impossible to tell without knowing die change in potential You have a loop of wire whose plane is parallel to the earth's surface, as shown. You now drop a bar magnet through the loop, with the north pole downward. Which of the following will happen? As seen from above, a counterclockwise current will be induced in the loop. As seen from above, a clockwise current will be induced in the loop. No current wJl be induced in file loop. The magnet will not fall, it will float above the loop, None of the above.

Explanation / Answer

Sol (5)Given

Answer (c) Their final speeds are same.

Explanation:

M(A) = 1 kg Q(A) = 1C ; M(B) = 2 Kg and Q(B) = 2C

We know that, under the influence of unform E field, the woek done on charged particle will be qE and it provides the necessary KE for the particle to move.

KE = W(E)

1/2 m v2 = Q E

v2 = 2 Q E / m

where v is the velocity of the particle, Q is the charge, and Ew is the electric field and M is its mass

V2(A) = 2 Q(A) E / M(A) = 2 x 1 x E / 1 = 2E

V2(B) = 2 Q(B) E / M(B) = 2 x 2 x E / 2= 2E

Dividing the above two

V2(A) / V2(B) = 2E /' 2 E = 1

V2(A) = V2(B)

Hence Option C id the correct one

Answer (c) Their final speeds are same.

Sol (6)

Answer: Option (A) Counterclock current will be induced in the loop.

Explanation

Because the magentic flux emerge out from the N pole and thus the B field pointing outwards from North.

The flux through the loop increases downward. The loop will form an upward point B field to appose the change in flux by the right hand rule, the current is needed to produce an upward pointing B field. Hence a counterclockwise current begins to flow in the loop.

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