JEE 2020 Revision: Current Electricity- 2

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Question 1

A charge particle having charge q₀ and mass m is entered into a magnetic field with velocity V₀ as shown. Uniform magnetic field is present only on right side of dotted line. Average force exerted on charge particle during time it is inside magnetic field.

• A
• B
• Czero
• D

Question 2

On two smooth fixed parallel rods a rod of mass m and length l is placed. Ends of fixed rod is connected with battery and resistance and uniform magnetic field is present inside the page switch is closed at t = 0

• Awhen switch is closed, rod will move in positive x-direction
• Brate of change of acceleration of rod will increase
• Cacceleration of rod is constant
• Dinitial current in circuit is zero

Question 3

In the circuit shown in figure C₁ = 2C₂. Switch S is closed at time t = 0. Let i₁ and i₂ be the currents flowing through C₁ and C₂ at any time t, then the ratio i₁/i₂ -

• Ais constant
• Bincreases with increase in time t
• Cdecreases with increase in time t
• Dfirst increases then decreases

Question 4

The value of resistance as measured across terminals A and B in figure would be : (Assume steady state)

• A20 kΩ
• B10 kΩ
• C15 kΩ
• D5 kΩ

Question 5

A bulb is made using two filaments. A switch selects whether the filaments are used individually or in parallel. When this bulb is used with a 15 volt battery, the bulb can developed 5W, 10W, or 15W power. Then resistances of filaments should be -

• A10Ω, 20 Ω
• B22.5 Ω, 22.5 Ω
• C22.5 Ω, 45 Ω
• D45 Ω, 90 Ω

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