1
CBSE 12th Physics (Term 1) Paper 2021-22
+0.77
-0
Two parallel conductors carrying current of 4.0 A and 10.0 A are placed 2.5 cm apart in vacuum. The force per unit length between them is -
A
6.4 $$\times$$ 10$$-$$5 N/m
B
6.4 $$\times$$ 10$$-$$2 N/m
C
4.6 $$\times$$ 10$$-$$4 N/m
D
3.2 $$\times$$ 10$$-$$4 N/m
2
CBSE 12th Physics (Term 1) Paper 2021-22
+0.77
-0
The magnetic field at the centre of a current carrying circular loop of radius R is B1. The magnetic field at a point on its axis at a distance R from the centre of the loop is B2. Then the ratio (B1 / B2) is
A
$$2\sqrt 2$$
B
$${1 \over {\sqrt 2 }}$$
C
$$\sqrt 2$$
D
$$2$$
3
CBSE 12th Physics (Term 1) Paper 2021-22
+0.77
-0
A current carrying wire kept in a uniform magnetic field, will experience a maximum force when it is
A
perpendicular to the magnetic field
B
parallel to the magnetic field
C
at an angle of 45$$^\circ$$ to the magnetic field
D
at an angle of 60$$^\circ$$ to the magnetic field
4
CBSE 12th Physics (Term 1) Paper 2021-22
+0.77
-0
A straight conducting rod of length l and mass m is suspended in a horizontal plane by a pair of flexible strings in a magnetic field of magnitude B. To remove the tension in the supporting strings, the magnitude of the current in the wire is
A
$${{mgB} \over l}$$
B
$${{mgl} \over B}$$
C
$${{mg} \over {lB}}$$
D
$${{lB} \over {mg}}$$
Class 12 Subjects
Chemistry
Physical Chemistry
Inorganic Chemistry
Organic Chemistry
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