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JEE Main 2022 (Online) 26th July Evening Shift
Numerical
+4
-1
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In a coil of resistance $$8 \,\Omega$$, the magnetic flux due to an external magnetic field varies with time as $$\phi=\frac{2}{3}\left(9-t^{2}\right)$$. The value of total heat produced in the coil, till the flux becomes zero, will be _____________ $$J$$.

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2
JEE Main 2022 (Online) 25th July Evening Shift
Numerical
+4
-1
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Magnetic flux (in weber) in a closed circuit of resistance 20 $$\Omega$$ varies with time t(s) at $$\phi$$ = 8t2 $$-$$ 9t + 5. The magnitude of the induced current at t = 0.25 s will be ____________ mA.

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3
JEE Main 2022 (Online) 27th June Evening Shift
Numerical
+4
-1
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A metallic rod of length 20 cm is placed in North-South direction and is moved at a constant speed of 20 m/s towards East. The horizontal component of the Earth's magnetic field at that place is 4 $$\times$$ 10$$-$$3 T and the angle of dip is 45$$^\circ$$. The emf induced in the rod is ___________ mV.

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4
JEE Main 2022 (Online) 26th June Morning Shift
Numerical
+4
-1
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A 10 $$\Omega$$, 20 mH coil carrying constant current is connected to a battery of 20 V through a switch. Now after switch is opened current becomes zero in 100 $$\mu$$s. The average e.m.f. induced in the coil is ____________ V.

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