Q20. In the figure, an α-particle moves a distance l in a uniform electric field E as shown. Does th

Q: What is the correct answer for CUET UG Physics Q20?

The correct answer is a. An α-particle carries a positive charge (+2e). The uniform electric field (E) is directed towards the right. Consequently, the electric force (F_e = qE) acting on the positively charged α-particle will also be directed towards the right, in the same direction as the electric field. However, the α-particle moves a distance 'l' to the left, which is opposite to the direction of the electric force. W

Q: Q20. In the figure, an α-particle moves a distance l in a uniform electric field E as shown. Does the Electric Field do a positive or a negative work on the α-particle? Does the electric potential…

The correct answer is a. An α-particle carries a positive charge (+2e). The uniform electric field (E) is directed towards the right. Consequently, the electric force (F_e = qE) acting on the positively charged α-particle will also be directed towards the right, in the same direction as the electric field. However, the α-particle moves a distance 'l' to the left, which is opposite to the direction of the electric force. W

Q: What are the options for this CUET UG Physics question?

A. Negative, increases · B. Positive, decreases · C. Negative, decreases · D. Positive, increases

Question

Q20. In the figure, an α-particle moves a distance l in a uniform electric field E as shown. Does the Electric Field do a positive or a negative work on the α-particle? Does the electric potential energy of the α-particle increase or decrease?
α
←
E
(a) Negative, increases
(b) Positive, decreases
(c) Negative, decreases
(d) Positive, increases

FirstInTest · Accepted Answer

An α-particle carries a positive charge (+2e). The uniform electric field (E) is directed towards the right. Consequently, the electric force (F_e = qE) acting on the positively charged α-particle will also be directed towards the right, in the same direction as the electric field. However, the α-particle moves a distance 'l' to the left, which is opposite to the direction of the electric force. Work done (W) by a force is given by W = F ⋅ d = Fd cosθ. Since the force and displacement are in opposite directions (θ = 180°), the work done by the electric field on the α-particle is negative. The change in electric potential energy (ΔU) is related to the work done by the electric field by ΔU = -W. Since W is negative, ΔU will be positive, meaning the electric potential energy of the α-particle increases. Therefore, the electric field does negative work, and the electric potential energy increases. Options (b), (c), and (d) incorrectly describe the work done or the change in potential energy.

Answer

Negative, increases

Answer

Positive, decreases

Answer

Negative, decreases

Answer

Positive, increases

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