A circular loop is placed in a uniform magnetic field. The total number of magnetic field lines passing normally through the plane of the coil is called

According to Lenz’s law, the direction of the induced current in a closed conducting loop is such that the induced magnetic field attempts to

A metre gauge train is heading north with speed 54 km/h in the Earth’s magnetic field $3\times 10^{-4}3\; \backslash times\; 10^\{-4\}$ T. The emf induced across the axle joining the wheels is

A conducting rod of length l rotates about one of its ends in a uniform magnetic field $\overrightarrow{B}\backslash overrightarrow\; B$ with a constant angular speed $\omega \backslash omega$. If the plane of rotation is perpendicular to $\overrightarrow{B}\backslash overrightarrow\; B$ , the emf induced between the ends of the rod is

A circular conducting loop of area 100 $c{m}^{2}cm^2$ and resistance 3 $\mathrm{\Omega }\backslash Omega$ is placed in a magnetic field with its plane perpendicular to the field. If the field is spatially uniform but varies with time t (in second) as B(f) = 1.5 cos $\omega \backslash omega$t tesla, the peak value of the current is

In a simple rectangular-loop ac generator, the time rate of change of magnetic flux is a maximum when

A simple generator has a 300 loop square coil of side 20 cm turning in a field of 0.7 T. How fast must it turn to produce a peak output of 210 V ?

A rectangular loop generator of 100 turns, each of area 1000 $c{m}^{2}cm^2$ , rotates in a uniform field of 0.02 $\pi \backslash pi$ tesla with an angular velocity of 60$\pi \backslash pi$ rad/s. The maximum value of volatage is

A 250 loop circular coil of area $16{\pi }^{2}c{m}^{2}16\; \backslash pi^2\; \backslash \; cm^2$ rotates at 100 rev/s in a uniform magnetic field of 0.5 T. The rms voltage output of the generator is nearly

Two tightly wound solenoids have the same length and circular cross-sectional area, but the wire of solenoid 1 is half as thick as solenoid 2. The ratio of their inductances is