Electromagnetic Waves — Physics STD 12 Science — Question

The particles emitted by a radioactive substance are deflected in a magnetic field. The particle may be:

In an electric motor, wires carrying a current of 5A are placed at right angles to a magnetic field of induction 0.8T. If each wire has length of 20cm, then the force acting on each wire is:

An object is immersed in a fluid. In order that the object becomes invisible, it should(a) Behave as a perfect reflector(b) Absorb all light falling on it(c) Have refractive index one(d) Have refractive index exactly matching with that of the surrounding fluid

Assertion  :  A person touching a high power line gets stuck with the line.
Reason     : The current carrying wires attract the man towards it.(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.(c) If assertion is true but reason is false.(d) If the assertion and reason both are false.

The magnetic field near a current carrying conductor is given by(a) Coulomb’s law(b) Lenz’ law(c) Biot-savart’s law(d) Kirchoff’s law

Lenz's law is a consequence of the law of conservation of:

Two coherent sources of different intensities send waves which interfere. The ratio of maximum intensity to the minimum intensity is 25. The intensities of the sources are in the ratio:

Consider the following two statements:

1. The linear momentum of a particle is independent of the frame of reference.
2. The kinetic energy of a particle is independent of the frame of reference.

1. Both A and B are true.
2. A is true but B is false.
3. A is false but B is true.
4. Both A and B are false.

A rod of length L and magnetic moment M is bent to form a semicircle. Now its magnetic moment will be: