Moving charge and Magnetism

Magnetic Field is

• Scalar quantity

• Vector quantity

• both (a) and (b)

• None of these

tesla is the unit of

• magnetic field

• electric field

• electric potential

• electric current

A circular coil of wire of 100 turns each of radius 8.0cm carries a current 0f 0.40 A Find The magnetic field at the centre of Coil

• 3.1x10 ^-4 T

• 24x10 ^-2 T

• 4x10 ^-8 T

• 9x10 ^-8 T

According to Biot-Savart law, Magnetic field at a point due to current carrying element depends on distance r of a point from Current Element as

• B ∝ r

• B ∝ 1/r

• B ∝ r²

• B ∝ 1/r ²

The magnetic Field at a point 20cm from long straight wire carrying current of 35A is

• 7.0x10 ^-5T

• 3.5x10 ^-5T

• 7.0x10 ^-3T

• 3.5x10 ^-3T

Magnitude of the magnetic field 80cm from the axis of a long st infinite wire is 7micro tesla calculate current in the coil

• 12A

• 24 A

• 28A

• 52A

The magnetic Field near a current carrying conductor is given by

• Coulomb’s law

• Lenz law

• Biot savart law

• Kirchhoff’s law

A closely wound solenoid 80cm long has 5layers of winding of 400turns each the diameter of solenoid is 1.8cm , if the current carried 8A Find the magnitude of B inside the solenoid at its centre

• 3.1x10 ^-4 T

• 24x10 ^-2 T

• 2.5x10 ^-2 T

• 9x10 ^-8 T

A 0.5m long Solenoid has 500 turns and has a flux density of 2.52x10^-3 T at its centre Find the current in the solenoid

• 2A

• 24A

• 5A

• 9A

A long straight wire carries an electric current of 2 A. the magnetic induction at a perpendicular distance of 5 m from the wire is (µ₀ = 4π X 10^-7 Hm^-1)

• 4 X 10^-8 T

• 8 X 10^-8 T

• 12 X 10^-8 T

• 16 X 10^-8 T