Semiconductor Electronic: Material, Devices And Simple Circuits — Physics STD 12 Science — Question

A current carrying loop is free to turn in a uniform magnetic field. The loop will then come into equilibrium when its plane is inclined at

(a) 0° to the direction of the field	(b) 45 ° to the direction of the field
(c)  90° to the direction of the field	(d) 135° to the direction of the field

Three α - particles and one β - particle decaying takes place in series from an isotope . Finally the isotope obtained will be

(a)

(b)

(c)

(d)

There is a relation between the radius (R) of the nucleus of an atom and the mass number (A) of the atom :

Which of the following statements is wrong ? Magnetic lines of force:

Point A is at a lower electrical potential than point B. An electron between them on the line joining them will:

In a permanent magnet at room temperature.

A conducting rod of length L is falling with velocity v perpendicular to a uniform horizontal magnetic field B. The potential difference between its two ends will be.

A nucleus of   originally at rest emits a particle with speed v. What will be the recoil speed of the daughter nucleus

(a) 4v/206

(b) 4v/214

(c) v/206

(d) v/214

Which of the following is not true for wire wound resistor?