When the north poles of two bar magnets are brought close together, there will be a force of attraction no force a force of repulsion a downward force TRUE ANSWER : ? YOUR ANSWER : ?
What will be the magnetic potential difference across the air gap of 2 cm length in magnetic field of 200 AT/m? 16 AT 8 AT 10 AT 4 AT TRUE ANSWER : ? YOUR ANSWER : ?
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 ? 6338 N/Wb 63380 N/Wb 63.38 N/Wb 633.8 N/Wb TRUE ANSWER : ? YOUR ANSWER : ?
A conductor of length L has current I passing through it, when it is placed parallel to a magnetic field. The force experienced by the conductor will be BLI2 None of the listed here Zero BLI TRUE ANSWER : ? YOUR ANSWER : ?
The magnetic materials exhibit the property of magnetisation because of spin of electrons either of these spin of nucleus orbital motion of electrons TRUE ANSWER : ? YOUR ANSWER : ?
The attraction capacity of electromagnet will increase if the Core length increases Core area increases Flux density increases Flux density decreases TRUE ANSWER : ? YOUR ANSWER : ?
The change of cross-sectional area of conductor in magnetic field will affect None of these both of the listed here reluctance of conductor resistance of conductor TRUE ANSWER : ? YOUR ANSWER : ?
A basic one-loop dc generator is rotated at 90 rev/s. How many times each second does the dc output voltage peak (reach maximum)? 270 180 360 90 TRUE ANSWER : ? YOUR ANSWER : ?
Main causes of noisy solenoid are uneven bearing surface, caused by dirt or uneven wear between moving and stationary parts None of these strong tendency of fan out of laminations at the end caused by repulsion among magnetic lines of force Both of the listed here TRUE ANSWER : ? YOUR ANSWER : ?
Materials subjected to rapid reversal of magnetism should have High co-ercivity and high retentivity Large area of B-H loop High permeability and low hysteresis loss High co-ercivity and low density TRUE ANSWER : ? YOUR ANSWER : ?