1) How can you induce Vemf in a loop with a constant cross-sectional area A plac

Question

1) How can you induce Vemf in a loop with a constant cross-sectional area A placed in a uniform magnetic field B?

a. Move the loop in the opposite direction of the magnetic field vector.

b. Rotate the loop around its axis perpendicular to the direction of the magnetic field vector.

c. Move the loop in the direction of the magnetic field vector.

d. Rotate the loop around its axis parallel to the direction of the magnetic field vector.

e. Move the loop in a direction perpendicular to the magnetic field vector.

2) What is the direction of the Electic field vector at any given point in relation to the equipotential line passing through that point?

a. Creates 45 degree angle with the equipotential line.

b. May have any direction.

c. Parallel to the equipotential line.

d. Perpendicular to the equipotential line.

3) Does the current lead or lag the voltage in an inductor?

a. It leads.

b. It lags.

c. They are in phase.

4) What formula describes the power dissipated through an element in a DC circuit?

a. P=IV

b. P=I^2/V

c. P=I^2V

d. P=IV^2

e. P=V^2/I

Explanation / Answer

(1)
Induced emf, e = d/dt * (B*A) = A*dB/dt
So,
Correct option is :-
(b) Rotate the loop around its axis perpendicular to the direction of the magnetic field vector.

(2)
Electric Field vector is allways Perpendicular to the equipotential line.

Correct option - (d)

(3)
Inductor current lags inductor voltage by 90o.
Correct option - (b) It lags

(4)
Power = Voltage * Current
P = V*I
Correct option - (a)

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