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An electric current passes through a long straight copper wire. At a perpendicular distance 5 cm from the straight wire, the magnetic field is B. The magnetic field at perpendicular distance 20 cm from the straight wire would be
The magnetic field due to a long straight current-carrying wire is given by: B = μ0I/2πr Here, B ∝ 1/r . If the distance increases from 5 cm to 20 cm (i.e., four times), the magnetic field decreases by the same factor: B′ = B/4. Therefore, the new magnetic field is B/4. Answer: (B) B/4. For more visRead more
The magnetic field due to a long straight current-carrying wire is given by:
B = μ0I/2πr
Here, B ∝ 1/r .
If the distance increases from 5 cm to 20 cm (i.e., four times), the magnetic field decreases by the same factor:
B′ = B/4.
Therefore, the new magnetic field is B/4.
Answer: (B) B/4.
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A wire in the form of a circular loop, of one turn carrying a current, produces magnetic induction B at the centre. If the same wire is looped into a coil of two turns and carries the same current, the new value of magnetic induction at the centre is
Magnetic induction at the center of a single-turn circular loop carrying current I is given by: B = μ0I/2R When the wire is looped into two turns, the number of turns n = 2 and the magnetic induction becomes: B' = n² B = 2²B = 4B Thus, the new magnetic induction at the center is 4B. Answer: (C) 4BRead more
Magnetic induction at the center of a single-turn circular loop carrying current I is given by:
B = μ0I/2R
When the wire is looped into two turns, the number of turns
n = 2 and the magnetic induction becomes:
B’ = n² B = 2²B = 4B
Thus, the new magnetic induction at the center is 4B.
Answer: (C) 4B.
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Currents of 10 A and 2 A are flowing in opposite directions through two parallel wires A and B respectively. If the wire A is infinitely long and wire B is 2 m long, then force on wire B which is situated at 10 cm from A, is
The magnetic force per unit length between two parallel currents is given by: F/L = μ0I₁ I₂/2πd Here, I₁ = 10 A, I₂ = 2 A, d = 0.1 m: Substituting values: F/L = (4π ×10⁻⁷) (10) (2)/2π (0.1) = 4 × 10⁻⁵ N/m For 2 m length of wire B, the total force is: F = 4 × 10⁻⁵ × 2 = 8 × 10⁻⁵ N Answer: (A) 8 × 1Read more
The magnetic force per unit length between two parallel currents is given by:
F/L = μ0I₁ I₂/2πd
Here, I₁ = 10 A, I₂ = 2 A, d = 0.1 m: Substituting values:
F/L = (4π ×10⁻⁷)
(10) (2)/2π (0.1) = 4 × 10⁻⁵ N/m
For 2 m length of wire B, the total force is:
F = 4 × 10⁻⁵ × 2 = 8 × 10⁻⁵ N
Answer: (A) 8 × 10⁻⁵ N.
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How did dance contribute to spreading moral values during the Bhakti movement?
During the Bhakti movement, dance played a crucial role in spreading moral values by portraying spiritual narratives and ethical lessons. It used expressive gestures, rhythmic movements and devotional themes to convey messages of love, faith and righteousness. Dance performances in temples and publiRead more
During the Bhakti movement, dance played a crucial role in spreading moral values by portraying spiritual narratives and ethical lessons. It used expressive gestures, rhythmic movements and devotional themes to convey messages of love, faith and righteousness. Dance performances in temples and public gatherings reinforced virtues like humility, devotion and selflessness, making religious teachings accessible to all. By engaging audiences emotionally and visually, dance became a powerful medium to promote ethical living and strengthen communal faith.
See lessWhy is it encouraged for both boys and girls to practice Lavani and Bhangra?
Allowing both boys and girls to practice Lavani and Bhangra encourages gender inclusivity in dance. It breaks stereotypes by showcasing that dance is for everyone, regardless of tradition or physicality. Lavani, traditionally performed by women, teaches grace and expressiveness, while Bhangra, knownRead more
Allowing both boys and girls to practice Lavani and Bhangra encourages gender inclusivity in dance. It breaks stereotypes by showcasing that dance is for everyone, regardless of tradition or physicality. Lavani, traditionally performed by women, teaches grace and expressiveness, while Bhangra, known for its energy, builds stamina and coordination. Learning these dances fosters cultural appreciation, self-confidence and teamwork. It ensures that traditional dance forms evolve, becoming more accessible and widely practiced across genders and generations.
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