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Magnetism and Electromagnetism

When two ends of a circular uniform wire are joined to the terminals of a battery, the field at the center of the circle?

Magnetism and Electromagnetism /
When two ends of a circular uniform wire are joined to the terminals of a battery, the field at the center of the circle?

A. will be zero
B. will be infinite
C. will depend on the amount of e.m.f. applied
D. will depend on the radius of the circle

When two ends of a circular uniform wire are joined to the terminals of a battery, the field at the center of the circle? Read More »

Magnetism and Electromagnetism

A 300 mm long conductor is carrying a current of 10 A and is situated at right angles to a magnetic field having a flux density of 0.8 T ; the force on the conductor will be____________?

Magnetism and Electromagnetism /
A 300 mm long conductor is carrying a current of 10 A and is situated at right angles to a magnetic field having a flux density of 0.8 T ; the force on the conductor will be____________?

A. 240 N
B. 24 N
C. 2.4 N
D. 0.24 N

A 300 mm long conductor is carrying a current of 10 A and is situated at right angles to a magnetic field having a flux density of 0.8 T ; the force on the conductor will be____________? Read More »

Magnetism and Electromagnetism

The electromagnet has 50 turns and a current of 1A flows through the coil. If the length of the magnet circuit is 200 mm, what is the magnetic field strength ?

Magnetism and Electromagnetism /
The electromagnet has 50 turns and a current of 1A flows through the coil. If the length of the magnet circuit is 200 mm, what is the magnetic field strength ?

A. 2500 AT/m
B. 250 AT/m
C. 25 AT/m
D. 2.5 AT/m

The electromagnet has 50 turns and a current of 1A flows through the coil. If the length of the magnet circuit is 200 mm, what is the magnetic field strength ? Read More »

Magnetism and Electromagnetism

Two long parallel conductors carry 100 A. If the conductors are separated by 20 mm, the force per meter of length of each conductor will be_____________?

Magnetism and Electromagnetism /
Two long parallel conductors carry 100 A. If the conductors are separated by 20 mm, the force per meter of length of each conductor will be_____________?

A. 100 N
B. 10 N
C. 1 N
D. 0.1 N

Two long parallel conductors carry 100 A. If the conductors are separated by 20 mm, the force per meter of length of each conductor will be_____________? Read More »

Magnetism and Electromagnetism

A 200 turn coil having an axial length of 30 mm and a radius of 10 mm is pivoted in a magnetic field having a flux density of 0.8 T. If the coil carries a current of 0.5 A, the torque acting on the coil will be_____________?

Magnetism and Electromagnetism /
A 200 turn coil having an axial length of 30 mm and a radius of 10 mm is pivoted in a magnetic field having a flux density of 0.8 T. If the coil carries a current of 0.5 A, the torque acting on the coil will be_____________?

A. 8 N-m
B. 0.48 N-m
C. 0.048 N-m
D. 0.0048 N-m

A 200 turn coil having an axial length of 30 mm and a radius of 10 mm is pivoted in a magnetic field having a flux density of 0.8 T. If the coil carries a current of 0.5 A, the torque acting on the coil will be_____________? Read More »

Magnetism and Electromagnetism

A square cross-sectional magnet has a pole strength of 1 x 10 Wb and cross sectional area of 20 mm x 20 mm. What is the strength at a distance of 100 mm from the unit pole in air ?

Magnetism and Electromagnetism /
A square cross-sectional magnet has a pole strength of 1 x 10 Wb and cross sectional area of 20 mm x 20 mm. What is the strength at a distance of 100 mm from the unit pole in air ?

A. 63.38 N/Wb
B. 633.8 N/Wb
C. 6338 N/Wb
D. 63380 N/Wb

A square cross-sectional magnet has a pole strength of 1 x 10 Wb and cross sectional area of 20 mm x 20 mm. What is the strength at a distance of 100 mm from the unit pole in air ? Read More »

Magnetism and Electromagnetism

What is the magnitude and the direction of force per 1.1m length of a pair of conductors of a direct current linecarrying 10 amperes and spaced 100 mm apart ?

Magnetism and Electromagnetism /
What is the magnitude and the direction of force per 1.1m length of a pair of conductors of a direct current linecarrying 10 amperes and spaced 100 mm apart ?

A. 22 x 10″8 N
B. 22 x 10″7 N
C. 22 x 10-6 N
D. 22 x 10″5 N

What is the magnitude and the direction of force per 1.1m length of a pair of conductors of a direct current linecarrying 10 amperes and spaced 100 mm apart ? Read More »

Magnetism and Electromagnetism