Magnetic flux passing through a coil is initially `4xx10^-4` Wb. It reduces to 10% of its original value in 't' second. If the e.m.f. induced is 0.72 mV then find 't' in seconds.

The magnetic flux linked with a coil satisfies the relation phi=4t^(2)+6t+9 Wb where t is the time in second. The e.m.f. induced in the coil at t =2 second is

Current (i) passing through a coil varies with time t as i=2t^(2) . At 1 s total flux passing through the coil is 10 Wb. Then

The magnetic flux through a coil is varying according to the relation phi=(4t^(2)+2t-5)Wb , t measured in seconds. Calculate the induced current through the coil at t = 2s, if the resistance of the coil is 5Omega .

The magnetic flux across a coil, of 50 turns and of diameter 0.1 m, changes from 3xx10^(-4)Wb" to "10^(-4)Wb in 0.02 s. The emf induced in the coil is

Find the change in magnetic flux (in Wb) in an inductor of 10H in which the emf induced is 300 V in 10^(-2)s .

The radius of each of two mutually perpendicular concentric coils is 2pi cm. Magnetic induction at the centre of the coils is 10^(-4)Wb.A^(-1) . If the current in the first coil be 8 A then what is the value of cuurent (in A) in the second coil? [mu_(0)=4pixx10^(-7)Wb.A^(-1).m^(-1)]

A particle starts from the origin and moves along a straight line. If the velocity of the particle at time t seconds be 10t cm/s, find the distance traversed during first 4 seconds after the start.

A circle passes through the origin and has its center on y=x If it cuts x^2+y^2-4x-6y+10=0 orthogonally, then find the equation of the circle.

The magnetic flux throgh a coil perpendicular to the plane is changing according to the relation phi=(3t^3+2t^2+50)Wb . Calculate the induced current through the coil at t = 3 sec, if the resistance of the coil is 3Omega .