Which is(are) true? Kirchhoff\'s second rule relates the sum of the emfs around

Question

Which is(are) true? Kirchhoff's second rule relates the sum of the emfs around a closed loop in a circuit to the potential changes across all resistors and circuit elements. implies conservation of energy in electric circuits. relates the currents entering and leaving any branch point in a circuit. all of the above two of the above none of the above The Hall effect provides empirical evidence that the charge carriers in metals are negative. can be used to determine the density of free electrons in a metal. both of the above neither of the above A resistor and an initially uncharged capacitor arranged in series are charged by a battery, which is connected at t = 0. The current in the circuit is constant because the emf supplied by the battery is constant. decreases exponentially in time. increases exponentially in time. There is no current because the electrons cannot flow through the gap in the capacitor. Which statements(s) is(are) true? Ohm's law asserts that the current in a conducting wire is proportional to the resistance of the wire. is a general law of nature like Newton's laws and Gauss' law? describes the electrical properties of some conducting materials. all of the above two of the above

Explanation / Answer

1) kirchoffs lawstates that the net electromotive force around a closed circuit loop is equal to the sum of potential drops around the loop. OR The algebraic sum of the changes in potential encountered in a complete traversal of a closed circuit loop must be zero.

Kirchhoff’s second law is a consequence of the law of conservation of energy.

Hence option a and c are correct

2) Now when comming to hall effect

The Hall effect is the production of a voltage difference across an electrical conductor, transverse to an electric current in the conductor and a magnetic field perpendicular to the current.

Yes Hall effect provides emphirical evidence that the charge carrirers in the metals are negative. This can be known by conducting halls experiment. in that we have to measure voltage , if voltage is negative then the charge carriers are negative implies electrons.

and it can also be used to determine the density of free electrons in a metal by using the below formulae

Rh = Ey/jxB.

option (c) is correct.

3) decreases exponentially with time

option (b) is correct

because i = i0 e(-t/RC)

4) option (c) is correct

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