An aircraft has a wing span of 35 m. It is flying horizontally with a speed of 9 ms^-1 and the vertical component of earth's magnetic field is 4 x 10^-5T. The potential difference between the tips of the wings will be

A coil has an area of 0.05 m² and has 800 turns. After placing the coil in a magnetic field of strength 4 x 10^-5 Wbm^-2, perpendicular to the field, the coil is rotated by 90^o in 0.1s.The average emf induced is 

The number of turns in a secondary coil is twice the number of turns in primary. A Leclanche cell of 1.5 V is connected across the primary. The voltage acrosss secondray is 

Two coils have a mutual inductance of 0.005 H. The current changes in the first coil according to the equation I = I₀ sin ωt where I₀ = 10A and ω = 100π rad/sec. The maximum value of e.m.f. in the second coil is 

If a current is passed through a spring, then the spring

A circuit has a self inductance of 1 H and carries a current of 2 A. To prevent sparking when the circuit is broken, a capacitor which can withstand 400 V is used. The capacitance of the capacitor is 

A coil of 1000 turns of wire is wound on a book and this book is lying on the table. The vertical component of earth's magnetic field is 0.6 x 10^-4 T and the area of the coil is 0.05m². The book is turned through 180^o about a horizontal axis in 0.1 second. The average e.m.f. induced in the coil is

A coil is wound in a transformer of rectangular cross-section. If all the linear dimensions of the transformer are increased by a factor of 3 and the number of turns per unit length remains the same, the self inductance increases by a factor of

During a current change from 2 A to 4 A in 0.05 second, 8 V of e.m.f. is developed in the coil. The coefficient of self induction is 

A 100 mH coil carries a current of 1 A. Energy stored in the magnetic field is