Atomic and Nuclear Physics — Physics STD 12 Science — Question

A bar magnet is situated on a table along east-west direction in the magnetic field of earth. The number of neutral points, where the magnetic field is zero, are(a) 2(b) 0(c) 1(d) 4

Assertion : Only microwaves are used in radar.
Reason    : Because microwaves have very small wavelength.(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 value of mutual inductance can be increased by.

Let Q and W denote the amount of heat given to an ideal gas and the work done by it in an isothermal process.

1. Q = 0
2. W = 0
3. Q ≠ W
4. Q = W

Two non-ideal identical batteries are connected in parallel. Consider the following statements      
(i) The equivalent e.m.f. is smaller than either of the two e.m.f.s
(ii) The equivalent internal resistance is smaller than either of the two internal resistances

S.I. unit of self-induction is :

In a charged capacitor, the energy resides:

Kirchhoff's current rule depends on:

According to classical theory, the path of an electron in Rutherford atomic model is: