1
JEE Main 2018 (Online) 16th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A coil of cross-sectional area A having n turns is placed in a uniform magnetic field B. When it is rotated with an angular velocity $$\omega ,$$ the maxium e.m.f. induced in the coil will be:
A
3 nBA$$\omega $$
B
$${3 \over 2}$$ nBA$$\omega $$
C
nBA$$\omega $$
D
$${1 \over 2}$$ nBA$$\omega $$
2
JEE Main 2018 (Online) 15th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
JEE Main 2018 (Online) 15th April Evening Slot Physics - Electromagnetic Induction Question 99 English
A copper rod of mass m slides under gravity on two smooth parallel rails, with separation l and set at an angle of $$\theta $$ with the horizontal. At the bottom rails are joined by a resistance R. There is a uniform magnetic field B normal to the plane of the rails, as shown in the igure. The terminal speed of the copper rod is :
A
$${{mg\,R\,\tan \,\theta } \over {{B^2}\,{l^2}}}$$
B
$${{mg\,R\,\cot \,\theta } \over {{B^2}\,{l^2}}}$$
C
$${{mg\,R\,\sin \,\theta } \over {{B^2}\,{l^2}}}$$
D
$${{mg\,R\,\cos \,\theta } \over {{B^2}\,{l^2}}}$$
3
JEE Main 2018 (Online) 15th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
At the center of a fixed large circular coil of radius R, a much smaller circular coil of radius r is placed. The two coils are concentric and are in the same plane. The larger coil carries a current I. The smaller coil is set to rotate with a constant angular velocity $$\omega $$ about an axis along their common diameter. Calculate the emf induced in their smaller coil after a time t of its start of rotation.
A
$${{{\mu _o}{\rm I}} \over {2\,R}}$$ $$\omega $$ $$\pi $$ r2 sin$$\omega $$ t
B
$${{{\mu _o}{\rm I}} \over {4\,R}}$$ $$\omega $$ $$\pi $$ r2 sin$$\omega $$ t
C
$${{{\mu _o}{\rm I}} \over {4\,R}}$$ $$\omega $$ r2 sin$$\omega $$ t
D
$${{{\mu _o}{\rm I}} \over {2\,R}}$$ $$\omega $$ r2 sin$$\omega $$ t
4
JEE Main 2017 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Change Language
A uniform magnetic field B of 0.3 T is along the positive Z-direction. A rectangular loop (abcd) of sides 10 cm × 5 cm carries a current I of 12 A. Out of the following different orientations which one corresponds to stable equilibrium ?
A
JEE Main 2017 (Online) 9th April Morning Slot Physics - Electromagnetic Induction Question 95 English Option 1
B
JEE Main 2017 (Online) 9th April Morning Slot Physics - Electromagnetic Induction Question 95 English Option 2
C
JEE Main 2017 (Online) 9th April Morning Slot Physics - Electromagnetic Induction Question 95 English Option 3
D
JEE Main 2017 (Online) 9th April Morning Slot Physics - Electromagnetic Induction Question 95 English Option 4
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