مقناطیسی میدان اور امالہ

Two long parallel wires carry current in the same direction. The force between them is:

• 1 Repulsive
• 2 Alternating
• 3 Attractive
• 4 Zero

What is the magnetic field 0.1 m from a long straight wire carrying 5 A? (μ₀ = 4 pi x 10⁻⁷ T m/A)

• 1 2 x 10⁻⁶ T
• 2 5 x 10⁻⁵ T
• 3 1 x 10⁻⁵ T
• 4 1 x 10⁻⁷ T

What is the magnetic field inside a long solenoid with 1000 turns per metre carrying 2 A? (μ₀ = 4 pi x 10⁻⁷ T m/A)

• 1 2.5 x 10⁻³ T
• 2 0.25 T
• 3 2.5 x 10⁻⁵ T
• 4 8 x 10⁻⁴ T

A magnetic field of 0.2 T is perpendicular to a loop of area 0.5 m². What is the magnetic flux through the loop?

• 1 0.1 Wb
• 2 2.5 Wb
• 3 0.7 Wb
• 4 0.4 Wb

A 0.2 m rod moves at 10 m/s at right angles to a magnetic field of 0.5 T. What emf is induced across it?

• 1 1 V
• 2 10 V
• 3 0.5 V
• 4 0.1 V