The length of axle of train running along magnetic north-south direction is 2 m. vertical component of earth's magnetic field is `1.25 times 10^-4` T. if the speed of train is 40 m/s, then induced emf across the axle of train is

A wheel with 20 metallic spokes each of length 8.0 m long is rotated with a speed of 120 revolution per minute in a plane normal to the horizontal component of earth magnetic field H at a place. If H=0.4xx10^(-4) T at the place, then induced emf between the axle the rim of the wheel is

Magadh express takes 16 hours to cover the distance of 960km between patna and Gaziabad. The rails are separated by 130 cm and the vertical component of the earth's magnetic field is 4.0 X 10^(-5) T . (a) Find the average emf induced across the width of the train. (b) If the leakage resistance between the rails is 100 Omega, find the retarding force on the train due to magnetic field.

The value of horizontal component of earth's magnetic field at a place is -.35xx10^(-4)T . If the angle of dip is 60^(@) , the value of vertical component of earth's magnetic field is about:

Angle of dip at a place is 30^(@) . If the vertical component of earth's magnetic field at that point is 7.5 xx 10^(-5) T, then the total magnetic field of earth at the point will be .

A horizontal straight wire 10m long extending from east to west is falling with a speed of 5.0m/s at right angles to the horizontal component of earths magnetic field 0.3 xx 10^(-4) tesla. The emf induced across the ends of wire is

A vertical rod of length l is moved with constant velocity v towards east. The vertical component of earth magnetic field is B and angle of dip is theta . The induced e.m.f. in the rod is

A wheel with 20 metallic spokes each 0.5 m long is rotated with a speed of 120 rev/min in a plane normal to the horizontal component of earth.s magnetic field H_E at a place. If H_g =0.4 G at the place, what is the induced emf between the axle and the rim of the wheel ? Note that 1G= 10^(-4)T.

A wheel with 10 metallic spokes each 0.5m long is rotated with a speed of 120 rev/min in a plane normal ot the horizontal components of earth's magnetic field B_(H) at a place. If B_(H)= 0.4G at the place, what is the induced emf between the axle and the rim of the wheel ? Note that 1G= 10^(-4) T

A conductor of 3 m in length is moving perpendicularly to magnetic field of 10^(-4) tesla with the speed of 10^(2)m//s , then the e.m.f. produced across the ends of conductor will be

A plane with a wing span of 18 m flies horizontally at a speed of 800 km/h. The vertical component of the Earth's magnetic field strength is about 40 A/m. Find the voltage across the tips of the wings.