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The magnetic potential energy stored in a certain inductor is 25 mJ, when the current in the inductor is 60 mA. This inductor is of inductance

(A)

1.389 H

(B)

138.88 H

(C)

0.138 H

(D)

13.89 H

NEET - Medical UG-2018 Medium

Answer & Solution:

\(\large{\text{Current=60mA, Magnetic Potential Energy=25mJ}\\{\Large1\over 2}LI^2=25mJ\\{\Large1\over 2}×L×3600×10^{-6}=25×10^{-3}\\L=13.89H }\)

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Other Questions of the same topic

Q1:

A resitance 'R' draws power 'P' when connected to an AC source. If an inductance is now placed in series with the resistance, such that the impedance of the circuit becomes 'Z', the power drawn will be:

(A)

\(\large p\sqrt{\frac{R}{Z}}\)

(B)

\(\large p\left ( \frac{R}{Z} \right )\)

(C)

P

(D)

\(\large p\left ( \frac{R}{Z} \right )^{2}\)

NEET - Medical UG-2015 Medium

Q2:

A 800 turn coil of effective area  \(\large 0.05 m^2\) is kept perpendicular to a magnetic field \(\large 5 \times 10^{-5} T\).When the plane of the coil is rotated by 90° around any of its coplanar axis in 0.1 s, the emf induced in the coil will be:

(A)

2 V

(B)

0.2 V

(C)

\(\large 2 \times 10^{-3} \) V

(D)

0.02 V

NEET - Medical UG-2019 Hard

Q3:

An electron moves on a straight line path XY as shown. The abcd is a coil adjacent to the path of electron . What will be the direction of current, if any, induced  in the coil

(A)

No current induced

(B)

abcd

(C)

adcd

(D)

The current will reverse its direction as the electron goes past the coil

NEET - Medical UG-2015 Medium

Q4:

A series R-C circuit is connected to an alternating voltage source. Consider two situations :-

(a) When capacitor is air filled.

(b) When capacitor is mica filled.

Current through resistor is i and voltage across capacitor is V then :-

(A)

\(\large V_{a}= V_{b}\)

(B)

\(\large V_{a}< V_{b}\)

(C)

\(\large V_{a}> V_{b}\)

(D)

\(\large i_{a}> i_{b}\)

NEET - Medical UG-2015 Hard

Chemistry Biology

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